ICD 10 Coding Alert

Question: A patient presented to the office with a painless lump behind their ear. Our otolaryngologist aspirated the mass and submitted the fine needle aspirate for pathologic diagnosis. The pathology report stated that the cellular material was “consistent with” pilomatrixoma. How should we code the diagnosis?

Utah Subscriber

Answer: In this case, you should report the diagnosis as R22.1 (Localized swelling, mass and lump, neck). While tempting, you should not code this as confirmed pilomatrixoma (D23.4 [Other benign neoplasm of skin of scalp and neck]).

Here’s why: For outpatient services, ICD-10-CM Official Guidelines, Section IV.G, states, “Do not code diagnoses documented as ‘probable,’ ‘suspected,’ ‘questionable,’ ‘rule out,’ ‘compatible with,’ ‘consistent with,’ or ‘working diagnosis’ or other similar terms indicating uncertainty. Rather, code the condition(s) to the highest degree of certainty for that encounter/visit, such as symptoms, signs, abnormal test results, or other reason for the visit.”

Effective Oct. 1, 2019, an update to the guidelines added “compatible with” and “consistent with” to the list of terms that indicate an uncertain diagnosis. Although pathology reports should no longer include those terms when stating a final, definitive diagnosis, providers sometimes still use the terminology.

Do this: Your responsibility as a coder is to assign the correct codes based on the words in the provider’s report. Based on what you’ve included in your question, you should report R22.1, not D23.4.

Alternatively, you may consult the pathologist for clarification — and possibly a discussion about documentation using those terms impact coding, treatment, and billing.