ICD-10 · PDGM grouping

C50-C50 — Malignant neoplasms of breast

Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.1.26.

OASIS-E2 v1.00.0 · ingested 2026-04-26

Codes in range

No clinical group

A period cannot be grouped from these.

Barred as primary

CMS rejects these in the primary position.

Where these codes group

38 of the 57 codes in C50-C50 group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. A further 19 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.

KMMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases38

Every code in C50-C50

Descriptions are CMS’s own, abbreviated as CMS abbreviates them.

Code	Description	Clinical group	Primary position
C50011	Malignant neoplasm of nipple and areola, right female breast	K	Accepted
C50012	Malignant neoplasm of nipple and areola, left female breast	K	Accepted
C50019	Malignant neoplasm of nipple and areola, unsp female breast	None	Cannot group
C50021	Malignant neoplasm of nipple and areola, right male breast	K	Accepted
C50022	Malignant neoplasm of nipple and areola, left male breast	K	Accepted
C50029	Malignant neoplasm of nipple and areola, unsp male breast	None	Cannot group
C50111	Malignant neoplasm of central portion of right female breast	K	Accepted
C50112	Malignant neoplasm of central portion of left female breast	K	Accepted
C50119	Malignant neoplasm of central portion of unsp female breast	None	Cannot group
C50121	Malignant neoplasm of central portion of right male breast	K	Accepted
C50122	Malignant neoplasm of central portion of left male breast	K	Accepted
C50129	Malignant neoplasm of central portion of unsp male breast	None	Cannot group
C50211	Malig neoplm of upper-inner quadrant of right female breast	K	Accepted
C50212	Malig neoplasm of upper-inner quadrant of left female breast	K	Accepted
C50219	Malig neoplasm of upper-inner quadrant of unsp female breast	None	Cannot group
C50221	Malig neoplasm of upper-inner quadrant of right male breast	K	Accepted
C50222	Malig neoplasm of upper-inner quadrant of left male breast	K	Accepted
C50229	Malig neoplasm of upper-inner quadrant of unsp male breast	None	Cannot group
C50311	Malig neoplm of lower-inner quadrant of right female breast	K	Accepted
C50312	Malig neoplasm of lower-inner quadrant of left female breast	K	Accepted
C50319	Malig neoplasm of lower-inner quadrant of unsp female breast	None	Cannot group
C50321	Malig neoplasm of lower-inner quadrant of right male breast	K	Accepted
C50322	Malig neoplasm of lower-inner quadrant of left male breast	K	Accepted
C50329	Malig neoplasm of lower-inner quadrant of unsp male breast	None	Cannot group
C50411	Malig neoplm of upper-outer quadrant of right female breast	K	Accepted
C50412	Malig neoplasm of upper-outer quadrant of left female breast	K	Accepted
C50419	Malig neoplasm of upper-outer quadrant of unsp female breast	None	Cannot group
C50421	Malig neoplasm of upper-outer quadrant of right male breast	K	Accepted
C50422	Malig neoplasm of upper-outer quadrant of left male breast	K	Accepted
C50429	Malig neoplasm of upper-outer quadrant of unsp male breast	None	Cannot group
C50511	Malig neoplm of lower-outer quadrant of right female breast	K	Accepted
C50512	Malig neoplasm of lower-outer quadrant of left female breast	K	Accepted
C50519	Malig neoplasm of lower-outer quadrant of unsp female breast	None	Cannot group
C50521	Malig neoplasm of lower-outer quadrant of right male breast	K	Accepted
C50522	Malig neoplasm of lower-outer quadrant of left male breast	K	Accepted
C50529	Malig neoplasm of lower-outer quadrant of unsp male breast	None	Cannot group
C50611	Malignant neoplasm of axillary tail of right female breast	K	Accepted
C50612	Malignant neoplasm of axillary tail of left female breast	K	Accepted
C50619	Malignant neoplasm of axillary tail of unsp female breast	None	Cannot group
C50621	Malignant neoplasm of axillary tail of right male breast	K	Accepted
C50622	Malignant neoplasm of axillary tail of left male breast	K	Accepted
C50629	Malignant neoplasm of axillary tail of unsp male breast	None	Cannot group
C50811	Malignant neoplasm of ovrlp sites of right female breast	K	Accepted
C50812	Malignant neoplasm of ovrlp sites of left female breast	K	Accepted
C50819	Malignant neoplasm of ovrlp sites of unsp female breast	None	Cannot group
C50821	Malignant neoplasm of overlapping sites of right male breast	K	Accepted
C50822	Malignant neoplasm of overlapping sites of left male breast	K	Accepted
C50829	Malignant neoplasm of overlapping sites of unsp male breast	None	Cannot group
C50911	Malignant neoplasm of unsp site of right female breast	K	Accepted
C50912	Malignant neoplasm of unspecified site of left female breast	K	Accepted
C50919	Malignant neoplasm of unsp site of unspecified female breast	None	Cannot group
C50921	Malignant neoplasm of unspecified site of right male breast	K	Accepted
C50922	Malignant neoplasm of unspecified site of left male breast	K	Accepted
C50929	Malignant neoplasm of unsp site of unspecified male breast	None	Cannot group
C50A0	Malignant inflammatory neoplasm of unspecified breast	None	Cannot group
C50A1	Malignant inflammatory neoplasm of right breast	K	Accepted
C50A2	Malignant inflammatory neoplasm of left breast	K	Accepted

Source: CMS HH PPS Grouper Software v07.1.26, effective 2026-04-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.

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C50-C50 — Malignant neoplasms of breast

Where these codes group

Every code in C50-C50

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