D47.09 — Other mast cell neoplasms of uncertain behavior
D47.09 is a billable, specific ICD-10-CM code for other mast cell neoplasms of uncertain behavior. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Extracutaneous mastocytoma
- Mast cell tumor NOS
- Mastocytoma NOS
- Mastocytosis NOS
Other codes that can never be billed with D47.09
These codes carry an Excludes1 note pointing at D47.09. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D47.09 alone.
Risk adjustment
D47.09 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
D47.09 is named in 21 Medicare coverage policies — 21 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
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- A56199Billing and Coding: Molecular Pathology Procedures
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- A56421Billing and Coding: CT of the Abdomen and Pelvis
How D47.09 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to D47.09.
- Mastocytoma(extracutaneous)
- Mastocytosis
- Mast cell›tumor
- Neoplasm, neoplastic›mast cell, of uncertain behavior NEC
- Tumor›mast cell
- Mast cell›neoplasm›of uncertain behavior NEC
Related codes at this level
Codes that share D47.0. If D47.09 is not quite right, the correct code is usually one of these.
Questions about D47.09
- Is D47.09 a billable ICD-10-CM code?
- Yes. D47.09 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does D47.09 sit in the tabular list?
- Neoplasms (C00-D49), in the block Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (D37-D48).