Journal of Obesity

Journal of Obesity / 2010 / Article

Research Article | Open Access

Volume 2010 |Article ID 637829 | 7 pages |

Variation in Provider Identification of Obesity by Individual- and Neighborhood-Level Characteristics among an Insured Population

Academic Editor: Mark A. Pereira
Received25 Aug 2009
Revised04 Jan 2010
Accepted23 Feb 2010
Published05 May 2010


Objective. The purpose of this study was to examine whether neighborhood- and individual-level characteristics affect providers' likelihood of providing an obesity diagnosis code in their obese patients' claims. Methods. Logistic regressions were performed with obesity diagnosis code serving as the outcome variable and neighborhood characteristics and member characteristics serving as the independent variables (N = 16,151 obese plan members). Results. Only 7.7 percent of obese plan members had an obesity diagnosis code listed in their claims. Members living in neighborhoods with the largest proportions of Blacks were 29 percent less likely to receive an obesity diagnosis ( ). The odds of having an obesity diagnosis code were greater among members who were female, aged 44 or below, hypertensive, dyslipidemic, BMI ≥ 35 kg/ , had a larger number of provider visits, or who lived in an urban area (all ). Conclusions. Most health care providers do not include an obesity diagnosis code in their obese patients' claims. Rates of obesity identification were strongly related to individual characteristics and somewhat associated with neighborhood characteristics.

1. Introduction

Although obesity disproportionately affects minorities and the socioeconomically disadvantaged [1], prior research has shown that clinician diagnosis and treatment of obesity is not consistent with underlying population prevalence [25]. Health care providers are more likely to diagnose younger adults and women as obese [6] and more likely to encourage weight loss activities among individuals who are White [7], are middle aged [810], or who have a higher socioeconomic status (SES) [8, 11, 12].

The relationship between residence in a socioeconomically deprived neighborhood and obesity diagnosis has not been studied. Research in other disease areas has identified a relationship between neighborhood characteristics and disease diagnosis. For example, residence in low SES neighborhoods has been associated with an increased likelihood of late-stage cancer diagnosis, particularly among Black and Hispanic women [2].

Social ecological theory forms the theoretical basis for this study and conceptualizes individuals as nested within broad social/environmental networks that influence their perceptions, outlooks, and behaviors. It suggests that neighborhood racial characteristics and SES may be important influences to consider in addition to individual-level characteristics [13, 14]. According to social ecological theory, individuals’ decisions and actions depend not only on their characteristics but also on the social forces that shape the contexts in which they live. In the case of physicians, these forces could originate from social institutions (e.g., health care systems, medical school), media, peer groups, or cultural norms. Each of these factors may serve as an intervening or moderating factor in the relationship between neighborhood characteristics and provider diagnosis of obesity.

Neighborhood characteristics may influence providers’ diagnosis of obesity through several possible pathways. For example, the location of residence may serve as a proxy for the availability of health system resources (e.g., health professional supply, health systems infrastructure, nutrition/fitness services). In areas where healthcare resources are limited, the diagnosis of obesity may be prioritized lower than acute medical problems resulting from excess body weight such as hypertension, type 2 diabetes, or hyperlipidemia. Social norms about body weight in a given neighborhood of residence may influence providers’ diagnosis of obesity. For example, Blacks, who are more accepting of excess weight, have less body weight dissatisfaction, and have higher body weight ideals compared to Whites [15, 16], may be less likely to cite body weight as a chief complaint. As a result, health care providers working in areas serving predominantly Black members may be less likely to diagnose their patients as obese. Underlying population prevalence of obesity in a given neighborhood may negatively or positively impact physician diagnosis of obesity. On the one hand, increased exposure to obese patients, particularly in areas with smaller healthcare facilities servicing a more homogenous population, may increase the likelihood of a physician diagnosis. On the other hand, negative physician attitudes towards patient body weight [17] and recent research which suggests that higher patient body mass index is associated with lower physician respect [18] may reduce the likelihood of an obesity diagnosis claim in areas characterized by a higher population prevalence.

Provider diagnosis of obesity can have significant clinical and behavioral consequences. Provider recognition of obesity is one of the biggest predictors of patient receipt of weight-related counseling and is associated with receipt of obesity-related services and patient self-efficacy [19, 20]. Also, patients who are told by their physicians that they are overweight are more likely to lose weight compared to those who are not told [21, 22]. Moreover, patients who are counseled about their weight or weight-related behaviors are more likely to report working on those areas [8, 10, 23], and patients who are advised by their physician to modify their behavior are generally more confident and motivated to engage in lifestyle modifications (e.g., dietary changes, increased physical activity) [8, 20, 24].

The purpose of this paper was to identify variation in provider identification of obesity in claims data by both neighborhood- and individual-level characteristics among obese, insured individuals. We hypothesized that plan members living in lower SES neighborhoods or neighborhoods with higher percentages of minority residents would be less likely to be diagnosed with obesity by their providers. We further hypothesized that obese plan members who are female, younger, and who had higher body mass indices (BMIs) would be more likely to receive an obesity diagnosis code in their claims.

A key contribution of this study to the existing literature is its inclusion of neighborhood characteristics in the analyses, which have received little attention to date. In light of current federal priorities to reduce obesity and eliminate health disparities [2527], there is a pressing need to better understand how neighborhood characteristics contribute to providers’ diagnosis of obesity.

2. Methods

2.1. Data

To examine whether neighborhood- and member-level characteristics affect whether providers include an obesity diagnosis code in their obese patients’ claims, we used 2002–2005 claims data linked to health risk assessment (HRA) data for a sample of health plan members enrolled in one of three Blue Cross Blue Shield (BCBS) plans from different sections of the country. The claims data included inpatient, outpatient, professional, and pharmacy claims records. The HRAs were administered through an in-person clinical encounter, an online survey tool on the BCBS plan’s website or direct mailing to eligible plan members (two health plan sites). For plan members completing an online or paper-based survey (two health plan sites), height and body weight were self-reported; members who completed an HRA during an in-person clinical encounter (one health plan site) had their height and body weight measured directly by a health care provider. Neighborhood data were obtained from the 2000 U.S. Census and linked to the members’ claims and HRA data based on their ZIP code listed in the enrollment file.

BCBS members were excluded from the study sample if they were enrolled less than 6 months in the year in which they completed an HRA, were less than 18 years old or their age was missing, had a pregnancy and/or delivery claim during 2002–2005, had a body mass index (BMI) less than 30 kg/m2 or greater than 100 kg/m2, or were missing height or body weight data needed to calculate their BMI. Some members eligible for the study were found to have multiple HRA records; in such cases, the most recent record was selected. The final study sample consisted of 16,151 obese adult plan members. During the study period, all three BCBS plans covered weight loss medications, nutritional counseling, and bariatric surgery as part of their benefits.

The data used in this study met Health Insurance Portability and Accountability Act’s (HIPAA) definition of a limited data set. The data were secured and used in accordance with federal standards for protecting the confidentiality of the personal health information of the enrollee. The Johns Hopkins University Office of Research Subjects deemed the study to be exempt from federal regulations because the research activities were considered to be of minimal risk to subjects.

2.2. Measures
2.2.1. Outcome Variable

The outcome variable of interest was an obesity claim, specifically, whether the provider included an obesity diagnosis code in their obese patients’ claims. An obesity claim was indicated by International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes in the claims data. In particular, an obesity claim was defined by the presence of ICD-9 codes for obesity (ICD-9 codes: 278, 278.0, 278.00, 278.01, 278.1, V77.8, or V85.3-V85.4).

2.2.2. Independent Variables

The main independent neighborhood-level variables of interest (measured at the ZIP code level) were the proportion of Black residents, median household income adjusted for inflation, percentage of residents with a high school diploma, and percentage of residents living in an urban area (each measured in tertiles) as well as the percentage of people living above the federal poverty line (based on a poverty income ratio at or above 1.00). The following member-level variables also were included in the models for their moderating or confounding influence on the outcome variable: age, sex, mean BMI obesity class (class I: BMI 30.0–34.9 kg/m2, class II: BMI 35.0–39.9 kg/m2, and class III: BMI 40 kg/m2), and diagnosis of type 2 diabetes, hypertension, or dyslipidemia. The comorbidities were measured as binary outcomes based on the presence of relevant ICD-9-CM codes in the claims data (see Tables 3 and 4 for codes). We also controlled for the distinct number of providers and the number of specialists seen by the members in the year in which the HRA data were collected.

2.3. Statistical Analysis

We used a multilevel logistic regression model to measure the associations between the outcome variable—obesity claim—and the neighborhood member characteristics. Analyses were performed using the Stata, version 9.2, software package (StataCorp LP, College Station, TX).

3. Results

3.1. Characteristics of the Study Sample

Table 1 reports the characteristics of the study sample overall and by the presence or absence of an obesity diagnosis code in their claims data. With respect to neighborhood characteristics (measured at the ZIP code-level), the mean proportion of Black residents was 5.3%, the median household income was 46,759, the mean percentage of high school graduates was 70.5%, the mean proportion of members living in urban ZIP codes was 81.7%, and the mean proportion of residents above the federal poverty threshold was 87.6%. These estimates for the study sample were relatively similar to 2000 U.S. Census estimates of 12.3% black, 41,994 median household income, 80.4% high school graduates, 79.0% urban, and 88.7% above the federal poverty threshold [28].

OverallObesity claim

Neighborhood-level characteristics (ZIP code level)
 Mean proportion of Black residents5.3%4.0%5.3%
 Median household income$43,846$44,908$43,636
 Mean percent high school graduate70.5%70.6%70.5%
 Mean proportion urban81.7%84.3%81.5%
 Mean proportion of residents above federal poverty87.6%87.2%87.6%
Member-level characteristics
 Mean age48.4 years47.2 years48.5 years
 Type 2 Diabetes10.3%15.9%9.8%
 Mean BMI34.737.634.5
 Obesity class
  Class I64.9%42.2%66.8%
  Class II23.1%29.8%22.6%
  Class III12.0%28.1%10.6%
 Mean number of distinct provider seen in HRA year2.02.91.9
 Mean number of specialist visits in HRA year8.212.07.8
Obesity claim
 Physician identification of obesity in claims data7.7%

With respect to member-level characteristics, 48.0% of the sample was female, the mean age was 48 years, 29.2% were hypertensive, 10.3% had type 2 diabetes, 26.8% had dyslipidemia, the mean BMI was 34.7 kg/m2, and 64.9% were class I obese. The mean number of distinct providers seen in the year they completed the HRA was 2.0 and the mean number of specialists seen in that same year was 8.2. Nearly 8% of the sample had an obesity diagnosis code recorded in their claims records.

3.2. Obesity Claim by BMI

Figure 1 illustrates the distribution of BMI by obesity claim. The mean BMI of obese members with an obesity claim was significantly higher than the mean BMI for members without an obesity claim (38.4 kg/m2 versus 34.5 kg/m2, ).

3.3. Neighborhood- and Individual-Level Predictors of Obesity Claim

Table 2 shows the multilevel logistic regression results relating neighborhood- and member-level characteristics to whether the provider included an obesity diagnosis code in the patients’ claims. Tertile ranges for the neighborhood-level variables in the model can be found in Table 4. After controlling for individual-level characteristics, BCBS members living in neighborhoods with the largest proportion of Blacks were 29 percent less likely to receive an obesity claim (OR = 0.71; 95% CI: 0.57, 0.89). BCBS members living in neighborhoods with the second largest proportion of Black residents were 21 percent less likely to receive an obesity claim (OR = 0.79; 95% CI: 0.64, 0.96). We also observed a significant association between provider identification of obesity in patient claims data and urbanity; BCBS members living in neighborhoods with the second largest proportion of urban residents were 62 percent more likely to receive an obesity claim (OR = 1.62; 95% CI: 0.31, 2.01). While we did not observe associations between household income and obesity diagnosis code in the patients’ claims, the direction of the effect was consistent with our study hypothesis that plan members living in lower SES neighborhoods would be less likely to be diagnosed with obesity by their providers. At the individual-level, the odds of having an obesity claim were greater among plan members who were female (OR = 1.47; 95% CI: 1.27, 1.96), age 44 or below (OR = 1.70; 95% CI: 1.48, 1.96), with hypertension (OR = 1.56; 95% CI: 1.29, 1.87), with dyslipidemia (OR = 1.56; 95% CI: 1.30, 1.88), with class II or III obesity (class II: OR = 2.02; 95% CI: 1.71, 2.38; class III: OR = 4.02; 95% CI: 3.38, 4.75) or who had a greater number of distinct provider visits (OR = 1.20; 95% CI: 1.16, 1.23).

OR (95% CI)

Neighborhood-level characteristics
 Proportion of Black residents
  Tertile 3 (highest)0.71 (0.57, 0.89)
  Tertile 20.79 (0.64, 0.96)
  Tertile 1 (lowest)1.00 (reference)
 Median household income
  Tertile 3 (highest)1.01 (0.84, 1.38)
  Tertile 20.98 (0.78, 1.24)
  Tertile 1 (lowest)1.00 (reference)
 Percent high school graduate
  Tertile 3 (highest)0.91 (0.72, 1.15)
  Tertile 21.14 (0.91, 1.42)
  Tertile 1 (lowest)1.00 (reference)
 Percent urban
  Tertile 3 (highest)1.10 (0.88, 1.38)
  Tertile 21.62 (1.31, 2.01)
  Tertile 1 (lowest)1.00 (reference)
 Percent above federal poverty threshold0.99 (0.97, 1.00)
Member-level characteristics
 Female1.47 (1.27, 1.70)
  Age 44 and below1.67 (1.45, 1.92)
  Age 45 and above1.00 (reference)
 Hypertension1.50 (1.26, 1.80)
 Type 2 Diabetes0.95 (0.80, 1.13)
 Dyslipidemia1.54 (1.28, 1.86)
 Obesity class
  Class III4.12 (3.45, 4.89)
  Class II2.04 (1.72, 2.41)
  Class I1.00 (reference)
 Number of distinct providers  seen in HRA year1.17 (1.13, 1.21)
 Number of specialist visits in  HRA year1.01 (0.99, 1.01)

Statistically significant at P<.05.
Note that the sample size in this model is smaller than the study sample due to missing individual-level characteristics among plan members.

DiagnosisICD-9 Code

Obesity278, 278.0, 278.00, 278.01, 278.1, V77.8, or V85.3-V85.4
Type 2 Diabetes250, 250.0, 250.00, 250.02, 250.1, 250.10, 250.12, 250.2, 250.20, 250.22, 250.3, 250.30, 250.32, 250.4, 250.40, 250.42, 250.5, 250.50, 250.52, 250.6, 250.60, 250.62, 250.7, 250.70, 250.72, 250.8, 250.80, 250.82, 250.9, 250.90, 250.92


Proportion of Black residents
 Tertile 3 (highest)2.0%–95.8%
 Tertile 20.6%–1.9%
 Tertile 1 (lowest)0.0%–0.6%
Median household income
 Tertile 3 (highest)$57,049–$159,538
 Tertile 2$39,543–$56,951
 Tertile 1 (lowest)$0.0–$39,526
Percent high school graduate
 Tertile 3 (highest)60.9%–100.0%
 Tertile 255.9%–60.8%
 Tertile 1 (lowest)19.8%–55.8%
Percent urban
 Tertile 3 (highest)99.8%–100.0%
 Tertile 293.5%–99.7%
 Tertile 1 (lowest)0.0%–93.4%

Note: The U.S. Census defines urban as densely settled areas containing at least 50,000 people (urban areas) and densely settled areas with a population of 2,500 to 49,999 (urban clusters).

4. Discussion

The central aim of this study was to identify variation in provider identification of obesity (as indicated by claims data) by neighborhood- and member-level characteristics among an insured population of obese Blue Cross Blue Shield plan members. Overall, we found that the proportion of Black residents in the members’ neighborhood was moderately associated with whether a provider included an obesity diagnosis code in their obese patients’ claims and that individual-level characteristics (female gender, younger age, obesity-related comorbidities, and BMI 35 kg/m2) were strongly associated with provider identification of obesity. Our results also suggest that most providers do not record obesity as a reason for clinical visits when billing private insurers. While all BCBS plans included in this study covered weight loss medications, nutritional counseling, and bariatric surgery during the study period, the widespread perception among providers that obesity is not a reimbursable medical condition [2931] may have contributed to this low diagnosis reporting rate.

These findings are similar to those of previous research. Like earlier studies, we observed differences in rates of obesity diagnosis codes by patients’ demographic characteristics [6, 32, 33]. Also similar to prior research, we observed higher rates of obesity claims among members with obesity-related comorbidities [6] and higher BMIs [34]. Also like previous studies [35, 36], we observed low rates of obesity diagnosis codes.

This study makes four important contributions to the evidence base. To our knowledge, this is the first paper to examine associations between neighborhood characteristics and receipt of an obesity claim. Second, because our study population is insured, our analyses are not confounded by financial barriers to access. Third, BCBS is the largest health insurer which likely makes the plans included in this study typical of the ones used by a large proportion of the U.S., thereby increasing the generalizability of study results. Fourth, the BCBS data used in this analysis are the largest and most current database that has been used to examine provider practice pattern of adult obesity care.

4.1. Limitations

There are several limitations to this analysis that deserve discussion. First, the cross-sectional nature of the study design prevents conclusions about causation. Second, the measure of obesity was based primarily on self-reported height and body weight. Because women tend to underestimate their true body weight and men tend to overestimate their actual height [37], some members may have been included or excluded from the sample erroneously and/or their BMI may have been misclassified. Likewise, individuals’ obesity classification may have changed over time depending on the timing of the HRA administration and medical encounters. Such changes also may have affected sample selection and BMI classification. Third, some providers may have verbally indicated that their patients were obese, or recorded obesity in the medical records, but did not submit the diagnoses in the insurance claims. We are unable to determine the extent to which patients were diagnosed with obesity but their diagnoses were not recorded in the insurance claims. Fourth, factors other than those included in the models (e.g., member race; provider race, age, gender, location of training; type of hospital) may influence providers’ diagnosis of obesity. Unfortunately, data for measuring those variables were not available. If these omitted variables affected the outcome, the results may be biased. Fifth, there may have been changes in sociodemographic characteristics between 2000, the year of the U.S. Census data used for measuring neighborhood characteristics, and 2002–2005, the years of the claims and HRA data used for measuring the outcome and member variables. If sociodemographic changes did occur, the study population may have been mischaracterized. However, it is unlikely that neighborhood characteristics changed significantly during the 3- to 5-year period and the study’s use of tertiles minimizes the effect of any changes that did occur on the results. Sixth, for some study participants, the ZIP code of residence may not be the same as the location of care. Because the members’ ZIP codes were obtained from the administrative data rather than the clinical data, providers may not be aware of the ZIP code where members live, which may explain why most of the neighborhood characteristics were not statistically significant. However, even in the absence of knowledge about members’ zip code of enrollment, providers may have a general sense of the neighborhood characteristics of their members’ place of residence. Seventh, three modes were used to collect the HRA data—an online survey tool on the BCBS plan’s website, a direct mailing to eligible plan members, or an in-person clinical encounter. Differences in the mode of data collection may introduce some bias to the results. Finally, it is possible that plan members had an obesity diagnosis code reported in a claim earlier or later than the year in which they completed an HRA.

4.2. Future Research

The results of this study suggest the need for more research. Going forward, more research is needed to better understand the impact of neighborhood context on the likelihood that a physician provides an obesity diagnosis code in their obese patients’ claims. In particular, why do individuals living in neighborhoods with the highest proportion of Black residents have a lower likelihood of having an obesity claim? And why do individuals living in more urbanized areas have a higher likelihood of having an obesity claim? Are there other, potentially more precise, neighborhood characteristics (not included in this analysis) that affect provider obesity claims? What is the appropriate unit of analysis to examine the relationship between neighborhood context and provider identification of obesity (e.g., ZIP code, Census block)? A better understanding of the association between neighborhood context and provider obesity claims could help better target local, state, and national efforts aimed at reducing obesity rates and eliminating health disparities [27].

4.3. Clinical, Public Health, and Research Implications

Given that receipt of an obesity diagnosis is an important gateway to receipt of obesity care [8, 10, 2024] and given the considerable costs associated with obesity and its comorbidities [38], insurers may consider increasing their coverage of obesity management and treatment as a way of reducing obesity-related costs in the long run. Such a change in member benefits would need to be clearly communicated since many physicians identify lack of payment by insurance companies as a key barrier to providing obesity care [2931].

Physicians and other health care professionals are uniquely positioned to have an impact on the obesity epidemic in the U.S. The results of this study suggest, however, that they may be missing opportunities to educate and treat their obese patients. Given the considerable health and economic consequences of obesity and its related comorbidities [39], providers who consistently diagnose their obese patients may facilitate modest weight loss at the individual-level which, in turn, may encourage significant health benefits and reduced costs at the population-level [40, 41]. Finally, the low level of obesity diagnoses reported in claims suggests that claims data may be a poor source of data for understanding trends in obesity diagnosis and treatment.

5. Conclusion

We found very low rates of obesity claims among an insured, obese population, particularly for members who were morbidly obese or living in neighborhoods with a higher proportion of Black residents. These findings indicate the need for better systems or incentive structures to encourage more appropriate diagnosis of obese patients in claims data.

Author Contributions

Sara N. Bleich and Jonathan P. Weiner conceived the study and developed the hypotheses. Sara N. Bleich analyzed the data. All authors contributed to the interpretation of study findings. Sara N. Bleich drafted the manuscript and all authors contributed to the final draft. Sara N. Bleich is the guarantor.


This study was funded by unrestricted research grants from Ethicon Endo-Surgery, Inc. (a Johnson & Johnson company); Pfizer, Inc; and GlaxoSmithKline. The data and in-kind database development support and guidance were provided by the BCBS Association, BCBS of Tennessee, BCBS of Hawaii, BCBS of Michigan, BCBS of North Carolina, Highmark, Inc. (of Pennsylvania), Independence Blue Cross (of Pennsylvania), Wellmark BCBS of Iowa, and Wellmark BCBS of South Dakota. Technical assistance with the claims data was provided by Thomas Richards, Andrew Shore, and Hsien-Yen Chang of Johns Hopkins Bloomberg School of Public Health.


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Copyright © 2010 Sara N. Bleich et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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