Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (D37-D48) ICD-10-CM
The D37–D48 section covers neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes with 27 ICD-10-CM diagnosis codes, of which 22 are billable in fiscal year 2026. The section is organized into the 1 code ranges listed below.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- neoplasms of unspecified behavior D49
Code Ranges in This Section 1 ranges · 27 codes
| Code Range | Title | Codes | Billable |
|---|---|---|---|
| D3A | Benign neuroendocrine tumors (D3A) | 27 | 22 |
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the D37–D48 Code Range
ICD-10 codes D37-D48 characterize a diverse group of medical conditions that involve neoplasms of uncertain behavior, along with polycythemia vera and myelodysplastic syndromes. These codes are used when a tumor’s nature is unclear—whether benign or malignant—or for specific blood and marrow disorders like polycythemia vera and myelodysplastic syndromes. This range helps healthcare providers accurately document and classify diseases that require careful monitoring and sometimes further diagnostic evaluation.
The D37-D48 codes cover tumors found in many body areas including the oral cavity, digestive system, respiratory organs, female and male genital organs, urinary system, central nervous system, endocrine glands, and connective tissues. For example, neoplasms of uncertain behavior of the lip, tongue, or major salivary glands are coded in the D37 series, including synonyms like “neoplasm of uncertain behavior of commissure of lip” and “neoplasm of uncertain behavior of parotid gland.” The range also includes specific blood-related conditions: D45 for polycythemia vera, known as a marrow disorder causing elevated red blood cells; and D46 for myelodysplastic syndromes, which involve ineffective blood cell production with terms like “refractory anemia with ring sideroblasts.” Codes in D47 address uncertain lymphoid and hematopoietic neoplasms, including mast cell diseases and chronic myeloproliferative disorders. Lastly, codes D48 describe uncertain behavior neoplasms in other tissues such as bone, soft tissue (including desmoid tumors), peripheral nerves, and skin. Using these codes ensures precise classification of growths and hematologic diseases where malignancy remains unconfirmed, aiding clinical assessment and treatment planning.
Questions About This Page
How many codes are in the D37-D48 range?
The D37-D48 range contains 27 ICD-10-CM diagnosis codes in FY 2026. 22 of them are billable, and the rest are category headers that organize the section.
What conditions does D37-D48 cover?
The range covers neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
