Question 1

What is ICD-10 code D44.9?

Accepted Answer

D44.9 is the ICD-10-CM diagnosis code for neoplasm of uncertain behavior of unspecified endocrine gland. A tumor of uncertain behavior in an endocrine gland when the specific gland location cannot be determined. D44.9 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (d37-d48).

D44.9 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

This is a catch-all code for unspecified endocrine gland neoplasms of uncertain behavior.

Question 2

Is D44.9 an HCC code?

Accepted Answer

D44.9 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 3

Is D44.9 billable?

Accepted Answer

Yes. D44.9 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. D44.9 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

Which HCC does D44.9 map to under V28?

Accepted Answer

D44.9 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 5

What RAF reference is published for D44.9?

Accepted Answer

D44.9 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

Question 6

What is the V28 vs V24 difference for D44.9?

Accepted Answer

D44.9 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

Question 7

What documentation supports D44.9?

Accepted Answer

This is a catch-all code for unspecified endocrine gland neoplasms of uncertain behavior Always attempt to identify the specific endocrine gland to use a more specific code if possible D44.9 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Question 8

Can D44.9 be a primary diagnosis?

Accepted Answer

Yes. D44.9 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Question 9

Which codes cannot be reported with D44.9?

Accepted Answer

The Excludes1 note that applies to D44.9 lists neoplasms of unspecified behavior (D49.-); multiple endocrine adenomatosis (E31.2-); multiple endocrine neoplasia (E31.2-); neoplasm of uncertain behavior of endocrine pancreas (D37.8); and 3 more (see the notes on this page). An Excludes1 condition is not reported together with D44.9; report one or the other, unless the two conditions are unrelated, which the ICD-10-CM Official Guidelines (Section I.A.12.a) allow.

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D44.9 ICD-10-CM Code: Neoplasm of uncertain behavior of unspecified endocrine gland

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D44.9

Is D44.9 an HCC code?

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