C50.91 – Malignant neoplasm of breast of unspecified site, female
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of breast (C50)
- Code
C50.91(claims format:C5091)- Description
- Malignant neoplasm of breast of unspecified site, female
- 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
- C50 Malignant neoplasms of breast (C50)
- Parent codes
- C50 › C50.9
Billable codes under C50.91
C50.91 is a header code and cannot be used on claims. Choose the most specific code:
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C50 – Malignant neoplasm of breast
- connective tissue of breast
- Paget's disease of breast
- Paget's disease of nipple
- code to identify estrogen, and other hormones and factors receptor status (Z17.-)
Index terms for C50.91
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Cancer, breast
- Carcinoma, lipid-rich
- Carcinoma, lobular, unspecified site
- Carcinoma, inflammatory, unspecified site
- Adenocarcinoma, lobular, unspecified site
- Adenocarcinoma, inflammatory, unspecified site
- Carcinoma, infiltrating, duct, unspecified site
- Carcinoma, ductal, with lobular, unspecified site
- Carcinoma, infiltrating, lobular, unspecified site
- Adenocarcinoma, infiltrating duct, unspecified site
- Carcinoma, infiltrating, ductular, unspecified site
- Carcinoma, ductular, infiltrating, unspecified site
- Adenocarcinoma, duct, infiltrating, unspecified site
- Carcinoma, lobular, with intraductal, unspecified site
- Carcinoma-in-situ, lobular, with, infiltrating duct, breast
- Disease, diseased, breast, Paget's, female, unspecified side
- Carcinoma, infiltrating, duct, with lobular, unspecified site
- Carcinoma, medullary, with, lymphoid stroma, unspecified site
- Carcinoma, duct, infiltrating, specified site, unspecified site
- Carcinoma, intraductal, papillary, with invasion, unspecified site
- Carcinoma, papillary, intraductal, with invasion, unspecified site
- Carcinoma-in-situ, lobular, with, infiltrating duct, unspecified site
- Carcinoma, duct, infiltrating, with lobular carcinoma, unspecified site
- Adenocarcinoma, papillary, intraductal, with invasion, unspecified site
- Adenocarcinoma, intraductal, papillary, with invasion, unspecified site
Related codes in C50.9
Frequently asked questions
What is ICD-10 code C50.91?
C50.91 is the ICD-10-CM code for malignant neoplasm of breast of unspecified site, female, in the block C50 (Malignant neoplasms of breast (C50)).
Is C50.91 a billable code?
No. C50.91 is a header code with more specific child codes; report one of the billable codes listed above.
What category does C50.91 belong to?
It belongs to category C50 – Malignant neoplasm of breast.
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.