Laboratory Diagnosis-Code Manipulation: When Coding Supplies the Missing Indication

Laboratory diagnosis code fraud uses invented diagnoses, recycled codes or pressure on providers to get tests paid without clinical support. The clinician sends an order. Somewhere between that order and the claim, the laboratory supplies a medical reason the clinician never gave. Taxpayers pick up the bill for tests justified by the billing desk. If you have been told to add a diagnosis because it gets a claim through, you know where the billing story can part company with the patient’s care.

Who Supplies the Diagnosis on a Laboratory Claim?

The ordering clinician supplies the diagnostic information. When the clinician sends a narrative instead of a code, the laboratory can translate that narrative into the appropriate diagnosis code or ask the clinician for more information. The support still comes from the clinician.

When a laboratory adds a diagnosis code to get Medicare payment, the decisive question is where that diagnosis came from. An unsupported code selected because it unlocks reimbursement makes the claim say something the treating provider never said about the patient.

The Office of Inspector General’s laboratory compliance guidance addresses the shortcuts directly: reusing information from earlier dates of service outside the standing-order provisions, creating diagnosis information that paid before, automatically inserting codes without diagnostic information from the ordering provider, and making up information for a claim.

These practices have the same commercial purpose. They fill the space between the test the laboratory wants to bill and the clinical information it actually received. The shortcut replaces this patient’s clinical information with a code that paid before.

What Evidence Is Needed to Prove Fraud?

The useful evidence connects what the clinician supplied to what the laboratory billed, and explains who changed it. The original requisition, chart narrative, later form versions, billing history and instructions each answer a different part of that question.

The records may be held in different places. Under CMS’s laboratory documentation guidance, the treating provider documents medical necessity in the patient’s record. The entity submitting the claim keeps the order, the diagnostic information received, and documentation of accurate processing and claim submission. The clinical justification may sit in a physician’s office or nursing facility while the laboratory holds the billing file.

The change history matters as much as the final screen. Fat Finger, Falsification, or Fraud?, a 2010 column in Spectroscopy, describes an audit trail that retains the original entry, identifies the person making a change, and records its date and reason. Applied to a billing edit, that approach directs attention to the original diagnosis, the replacement or addition, and the person or automated instruction responsible.

We examine those connections with you. A biller may know the instruction that accompanied the edit. Someone in the ordering practice may know what the clinician actually supplied. Together, those accounts can explain a discrepancy that the final claim conceals.

When the Requisition Changes the Decision

A requisition shapes both which tests get ordered and which diagnoses accompany them. The form’s design matters because the provider is supposed to make a medical-necessity decision for each test the laboratory bills.

Model Plan Helps Laboratories Fight Fraud, published in Laboratory Medicine in 1997, described uniform requisitions with space for the physician to document each test’s medical necessity. It also described notices explaining the components of laboratory profiles and how the laboratory would bill them.

The same issue appears in Genotox Laboratories’ 2023 civil settlement. Genotox admitted offering custom profiles through which providers preselected tests that the laboratory then performed and billed for all or nearly all of their patients, generally in the highest reimbursement categories. The profile carried the selection forward from patient to patient.

If a laboratory sales rep fills out the diagnosis on a requisition, we examine whose clinical information the rep entered and what the provider was asked to approve. The form, communications and submitted claim show whether the diagnosis came from the patient’s care or from pressure to obtain payment. Singulex’s diagnosis-code allegations, discussed below, put that pressure on the ordering side.

A treating provider can also make an order conditional: perform an additional test if the first result meets the condition the provider specified. The relevant comparison is the laboratory’s reflex protocol against that patient’s order and medical record. Adding a diagnosis in billing cannot supply the provider’s missing decision.

Vista, Singulex and SmithKline Show How the Code Moves

Diagnosis manipulation can happen after the order reaches billing, while a provider is choosing diagnoses, or as part of a broader laboratory billing scheme. These cases put the decision at different points in the business.

Vista and the Macro at the Billing Desk

Vista Clinical Diagnostics and two other laboratories agreed in July 2024 to pay $2,450,000 to resolve allegations of manipulated diagnosis codes. The Justice Department alleged that macros generated codes for Medicare and Medicaid submissions that the patients’ physicians had not provided.

The case began with a former Vista employee. Her complaint alleged that staff initially added diagnoses manually, then used macros to add codes to groups of patients in an Excel billing report. A spreadsheet linked the macros to the procedure codes for the tests ordered. The alleged source of the added diagnosis was the test being billed.

The complaint described how the instruction reached the billing desk:

The employee alleged that managers explained the additions as a way to ensure payment or a particular reimbursement rate. As the volume grew, she was allowed to train other employees to use the macros.

One example in the complaint follows a Medicare specimen from order to billing: the provider supplied R35.1, and D64.9 was allegedly added after collection and testing.

Singulex and Pressure on Providers

Singulex’s August 2018 settlement addressed the ordering side of diagnosis manipulation. The Justice Department alleged that the company pressured health care providers to select diagnosis codes without regard to patients’ medical conditions, or added codes to test orders without providers’ knowledge or consent.

Here, the comparison reaches beyond the laboratory’s final billing entry. The provider’s narrative, the requisition and the communications seeking a particular diagnosis show how the code arrived on the order. The completed diagnosis field conceals the pressure that produced it.

SmithKline’s Earlier Diagnosis-Code Allegations

SmithKline Beecham Clinical Laboratories’ 1997 civil settlement included allegations of fabricated diagnosis codes and altered test codes, alongside billing for tests that were unnecessary, unordered or unperformed.

Those are distinct changes to the billing story. Fabricating a diagnosis supplies a supposed medical reason. Altering a test code changes how the service is represented. The documents need to show which decision changed: the reason for the test or the service ordered or performed.

A Paid Claim Still Needs a Clinical Reason

A code that passes a payment edit still needs support in the treating provider’s order and the patient’s clinical information. Getting through the edit cannot supply that medical reason.

Medicare’s National Coverage Determinations and Local Coverage Determinations govern coverage. Laboratory claims-edit software applies national coverage policies consistently, distinguishing diagnosis codes that support coverage from codes that do not. That gives an unsupported code change its commercial purpose: getting a claim through the payment edit.

The clinical question remains patient-specific. CMS requires the treating provider to order diagnostic laboratory tests and use the results to manage the patient’s medical problem. The laboratory must preserve what it received and show that the claim accurately reflects that information.

Do Lab Orders Need to Be Signed?

Medicare does not require a signature on an order for clinical diagnostic tests paid under the clinical laboratory fee schedule. The provider must document the intent to order in the medical record. CMS’s guidance permits an unsigned order supported by an authenticated medical record.

What Is the Difference Between Preventive and Diagnostic Laboratory Billing?

Medicare’s diagnostic testing coverage turns on the medical reason for the test. Preventive screening looks for disease before signs or symptoms appear and needs its own Medicare coverage. Changing the diagnosis field cannot create the clinical information supporting diagnostic coverage.

For the coding insider, the useful connection is between the reason documented for this patient and the reason submitted to the payer. A request to make the test payable belongs beside the provider’s actual account of why it was ordered.

When the Billing Instruction Becomes a Whistleblower Case

A diagnosis-code case comes into focus when the records connect unsupported diagnoses, government claims and the decisions behind the additions. Vista’s allegations show how much the billing desk can see: group edits, management instructions, the explanation given for adding codes and the training of other staff.

The laboratory’s system may hold the changes while the practice holds the clinical explanation. We bring those parts together with the insider who understands the work. If you ran the macro or entered the code under a supervisor’s instruction, speak with us about your part in it as we assess the healthcare whistleblower case with you.

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

You Know Why the Code Was Added

If you work in laboratory billing, sales or an ordering practice and know who supplied the missing diagnosis, speak with our whistleblower experts about the instruction behind the code. We work beside you to build the case around the clinical record, the altered claim and the decisions that connected them. We bring in laboratory fraud whistleblower lawyers who understand medical-necessity and coding disputes, and stay with you throughout the case.