D49 – Neoplasms of unspecified behavior

ICD-10-CM 2027 diagnosis code · Neoplasms of unspecified behavior (D49)

Non-billable header

ICD-10-CM code D49

Code: D49 (claims format: D49)
Description: Neoplasms of unspecified behavior
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 2. Neoplasms (C00-D49)
Block: D49 Neoplasms of unspecified behavior (D49)

Billable codes under D49

D49 is a header code and cannot be used on claims. Choose the most specific code:

D49.0 – Neoplasm of unspecified behavior of digestive systemBillable
D49.1 – Neoplasm of unspecified behavior of respiratory systemBillable
D49.2 – Neoplasm of unspecified behavior of bone, soft tissue, and skinBillable
D49.3 – Neoplasm of unspecified behavior of breastBillable
D49.4 – Neoplasm of unspecified behavior of bladderBillable
D49.5 – Neoplasm of unspecified behavior of other genitourinary organsHeader (more codes below)
D49.6 – Neoplasm of unspecified behavior of brainBillable
D49.7 – Neoplasm of unspecified behavior of endocrine glands and other parts of nervous systemBillable
D49.8 – Neoplasm of unspecified behavior of other specified sitesHeader (more codes below)
D49.9 – Neoplasm of unspecified behavior of unspecified siteBillable

Notes for D49

Includes:

'growth' NOS
neoplasm NOS
new growth NOS
tumor NOS

Excludes2 (not included here):

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.

Frequently asked questions

What is ICD-10 code D49?

D49 is the ICD-10-CM code for neoplasms of unspecified behavior, in the block D49 (Neoplasms of unspecified behavior (D49)).

Is D49 a billable code?

No. D49 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.