Understanding Diagnosis Fishing
Image Credit: CoPilot
“Diagnosis fishing” is an informal compliance term used to describe documentation or coding behavior where the medical record appears to be searching for, adding, or selecting diagnoses primarily to support billing, coverage, risk adjustment, or severity—rather than reflecting the patient’s actual clinical condition at the time of service. In other words, the documented diagnosis is being driven by reimbursement logic instead of clinical reality.
How does this happen?
This can occur for a number of reasons, intentionally or unintentionally. The examples below highlight common patterns, but do not represent all possible scenarios.
- Template overuse
- Poor query practices
- EHR prompts
- Pressure to meet coverage criteria
- Misunderstanding medical necessity rules
Three Compliance Hot Spots:
Area 1: HCC Coding and Risk Adjustment
HCC – Diagnosis fishing is particularly dangerous in HCC programs because:
- Diagnoses directly translate into payment.
- Unsupported diagnoses trigger RADV and OIG audits.
- Financial impact extends beyond individual claims to entire contracts.
- Providers may inherit risk through downstream agreements.
This is why many organizations now treat diagnosis fishing as a risk adjustment integrity issue, not just a documentation habit.
Area 2: Critical Care Audit Red Flags
Critical Care: Providers must base critical care billing on treatment of a life‑threatening condition, not on ICU placement, time thresholds, or diagnosis alone.
Area 3: Chronic Care Management (CCM / APCM) Checks
CMS allows chronic conditions to be reported only when they are relevant, evaluated, or managed. Copy‑forward diagnoses that inflate complexity without encounter‑specific support are a major audit vulnerability, particularly in CCM, APCM, and value‑based programs.
How this appears in the record:
- Long problem lists copied forward without reassessment.
- Chronic conditions included to justify CCM enrollment or complexity.
- Diagnoses documented but not addressed in assessment or plan.
- Conditions that appear repeatedly but never change or receive care.
This is often unintentional diagnosis fishing, driven by templates and EHR defaults.
CCM – Confirm the following:
- ☐ Patient has 2+ qualifying chronic conditions expected to last ≥12 months
- ☐ Each reported condition is actively addressed during the month billed
- ☐ Care plan updates align with listed diagnoses
- ☐ Diagnoses are not included solely to justify enrollment or complexity
Red flags: Long problem lists without monthly clinical engagement.
Final Thoughts
Report only diagnoses supported by the medical record. Medicare explicitly states that documentation must reflect the reality of the patient’s condition, not be shaped to meet coverage rules. Avoid adding diagnoses without clear clinical support written in the medical record.
Resources
CMS/Noridian – Diagnosis make the service payable