D49
ICD-10Non-billable categoryNeoplasms of unspecified behavior
Official ICD-10-CM descriptor (FY2026)
Neoplasms of unspecified behavior
D49 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Includes
- 'growth' NOS
- neoplasm NOS
- new growth NOS
- tumor NOS
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- neoplasms of uncertain behavior (D37-D44, D48)
Notes
- Category D49 classifies by site neoplasms of unspecified morphology and behavior. The term 'mass', unless otherwise stated, is not to be regarded as a neoplastic growth.
More specific codes under D49
- D49.0Neoplasm of unspecified behavior of digestive system
- D49.1Neoplasm of unspecified behavior of respiratory system
- D49.2Neoplasm of unsp behavior of bone, soft tissue, and skin
- D49.3Neoplasm of unspecified behavior of breast
- D49.4Neoplasm of unspecified behavior of bladder
- D49.5Neoplasm of unsp behavior of other genitourinary organscategory
- D49.6Neoplasm of unspecified behavior of brain
- D49.7Neoplm of unsp behav of endo glands and oth prt nervous sys
- D49.8Neoplasm of unspecified behavior of other specified sitescategory
- D49.9Neoplasm of unspecified behavior of unspecified site
Where this code sits
- Chapter
- 2. Neoplasms (C00-D49)
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.