Medicare Advantage Morbid Obesity Coding Fraud: The Code Says One Thing, the BMI Says Another

Medicare Advantage morbid obesity coding fraud allegations concern insurers that submitted diagnoses for higher payments despite a contradictory recorded BMI. In settlements with Cigna and Aetna, the Justice Department alleged that the insurers submitted or retained morbid-obesity codes that the patients’ body mass index recordings did not support. The code brought in money. The measurement was already in the medical record. For a coding auditor, the question reaches beyond the mismatch to who saw it and what happened next.

Why a Morbid-Obesity Code Changes the Payment

A diagnosis can increase a Medicare Advantage plan’s monthly payment by raising the patient’s risk score. The Centers for Medicare & Medicaid Services pays private plans a fixed monthly amount adjusted for expected health care costs. Plans submit diagnosis codes that help determine the adjustment to that payment.

That is the financial connection behind this risk-adjustment fraud allegation. A coder reviewing an existing chart can find a condition that increases payment. The same review can reveal that an earlier code lacks support and needs to come out. According to the Justice Department’s accounts of both insurers, the companies used review results to obtain additional payments while leaving unsupported codes in place. Taxpayers paid for the additions while the findings that called for repayment went unused.

Cigna’s Morbid-Obesity Allegations Named the BMI Threshold

Cigna’s morbid-obesity allegations covered payment years 2016 to 2021. In its September 2023 settlement announcement, the Justice Department said individuals with a BMI below 35 could not properly be diagnosed as morbidly obese. It alleged that Cigna knowingly submitted or failed to delete codes for people whose records lacked a BMI at or above that threshold, increasing Medicare’s payments.

For an insider, the comparison is concrete: the diagnosis sent for payment against the measurement in the patient’s own record.

The alleged conduct included leaving a code in place. That reaches the employee who reviewed an existing diagnosis, flagged the contradiction and then watched the submission remain unchanged. What the plan learned during review matters alongside the original coding decision.

Cigna’s resolution also covered a separate one-way chart-review program and diagnoses generated during home visits. The obesity allegation had its own payment period and its own stated contradiction.

Aetna’s Allegations Turned on the Recorded BMI

Aetna’s morbid-obesity allegations covered payment years 2018 to 2023. The Justice Department’s March 2026 announcement alleged that Aetna knowingly submitted or failed to withdraw morbid-obesity codes for people whose recorded BMI was inconsistent with that diagnosis. Those codes increased payments from the Centers for Medicare & Medicaid Services.

The whistleblower behind the obesity case was a former Aetna risk-adjustment coding auditor. An auditor can see both the diagnosis proposed for payment and the chart used to support it.

Aetna’s separate chart-review allegations concerned payment year 2015. The Justice Department alleged that paid coders found additional diagnoses but also failed to substantiate some previously submitted codes. Aetna allegedly used the findings that brought in more money and ignored the findings that required reimbursement. The obesity case concerned a later payment period and a particular conflict inside the medical records.

A Coding Auditor’s Whistleblower Reward

Aetna’s obesity settlement provided for a whistleblower reward of about $2 million. That award belonged to the morbid-obesity resolution within the company’s $117.7 million settlement, which also resolved chart-review allegations.

Cigna’s national resolution was $172,294,350. It included the separate $37 million home-visit settlement. The announced $8.14 million whistleblower reward came from those home-visit allegations.

A whistleblower case under the False Claims Act can pay 15% to 30% of what the government recovers.

The Contradiction Also Appeared at a Physician Practice

The same BMI issue appeared in a provider case before either insurer’s settlement. In May 2023, the Justice Department announced a $1.5 million settlement involving Complete Physician Services, a Philadelphia primary care practice. Former employees brought the qui tam case.

The government alleged that, from 2015 to 2018, the practice submitted unsupported diagnosis codes, including morbid-obesity diagnoses for patients with a BMI under 35, increasing reimbursement to Medicare Advantage insurers. The allegation puts the originating practice in view. The diagnosis can begin with a provider and reach Medicare through a plan’s submission.

That gives an insider a useful distinction about responsibility. A practice employee may know how the diagnosis entered the chart. A plan auditor may know what happened when the supporting record reached the insurer. Their accounts can explain different decisions involving the same payment input.

An Audit Traced the Code to an Overpayment

A federal audit of SCAN Health Plan supplies a concrete example of the payment effect. In its February 2022 report, the Department of Health and Human Services’ Office of Inspector General described an enrollee whose submitted morbid-obesity diagnosis lacked support in the medical records. The independent medical reviewer found no mention of morbid obesity and said the recorded BMI was well within the normal range.

The unsupported code had added a condition category to the enrollee’s risk score. The Inspector General attributed a $912 overpayment for the year to that error. Here the audit connected the submitted code, the record contradiction and the payment consequence for a particular enrollee.

Coding Prompts and Contracts Explain Who Benefits

An organization can influence the diagnosis before a plan auditor ever sees it. Medicare Advantage Fraud, Waste, and Abuse Policy Options, published by the American Institutes for Research in 2026, describes how plan ownership of provider businesses can give plans more influence over coding. The report identifies coding protocols, electronic-record prompts, documentation incentives and retrospective chart reviews as ways to increase risk scores.

Its discussion of provider payment incentives explains why the practice may share in the increase. Under sub-capitation, a plan pays a provider group an upfront fee and the group pays its own physicians on a capitated basis. The report describes the financial connection: such arrangements are usually set as a percentage of premium, so as coding intensity rises, Medicare’s payment to the plan rises and the provider’s revenue rises with it.

For a BMI contradiction, that makes the coding instruction and the payment arrangement worth examining together. We work through who requested the diagnosis, what information accompanied the request and who benefited if it remained. The report explains an incentive an insider may recognize. The patient record and the organization’s response show how that incentive operated in a particular matter.

When the BMI Conflict Reached the Decision-Makers

The most useful insider account connects the recorded BMI to the code submitted for the relevant payment year and the response when someone questioned it. We examine that sequence with you: the encounter record, the later review, the submission and what changed after the contradiction surfaced.

An internal correction and a corrected payment input are separate events to trace. We establish whether the plan corrected what it sent to Medicare when it corrected its own records.

The response to a coding objection can explain the decision behind the data. A review finding, an instruction to retain a diagnosis or a decision to stop examining it can connect the contradiction to the people responsible for the submission. We work through who received the finding and what they authorized afterward.

That is where an insider adds something the public Medicare Advantage fraud announcements cannot supply. A healthcare coder, auditor or clinician may know why an unsupported diagnosis survived a review that had already exposed the problem.

When You Know Why the Code Stayed

If you saw a BMI contradiction dismissed or an unsupported obesity code survive review, speak with our whistleblower experts about the decision behind that code. We build the case with you around the clinical record, the submission and who knew they conflicted, bringing in Medicare Advantage whistleblower lawyers who understand risk-adjustment coding disputes. We stay beside you as your knowledge of that decision becomes the foundation of the case.