ICD-10 · PDGM grouping

C00-C14 — Malignant neoplasms

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

59 of the 65 codes in C00-C14 group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. A further 6 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 Diseases59

Every code in C00-C14

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

Code	Description	Clinical group	Primary position
C000	Malignant neoplasm of external upper lip	K	Accepted
C001	Malignant neoplasm of external lower lip	K	Accepted
C002	Malignant neoplasm of external lip, unspecified	None	Cannot group
C003	Malignant neoplasm of upper lip, inner aspect	K	Accepted
C004	Malignant neoplasm of lower lip, inner aspect	K	Accepted
C005	Malignant neoplasm of lip, unspecified, inner aspect	None	Cannot group
C006	Malignant neoplasm of commissure of lip, unspecified	K	Accepted
C008	Malignant neoplasm of overlapping sites of lip	K	Accepted
C009	Malignant neoplasm of lip, unspecified	None	Cannot group
C01	Malignant neoplasm of base of tongue	K	Accepted
C020	Malignant neoplasm of dorsal surface of tongue	K	Accepted
C021	Malignant neoplasm of border of tongue	K	Accepted
C022	Malignant neoplasm of ventral surface of tongue	K	Accepted
C023	Malig neoplasm of anterior two-thirds of tongue, part unsp	K	Accepted
C024	Malignant neoplasm of lingual tonsil	K	Accepted
C028	Malignant neoplasm of overlapping sites of tongue	K	Accepted
C029	Malignant neoplasm of tongue, unspecified	K	Accepted
C030	Malignant neoplasm of upper gum	K	Accepted
C031	Malignant neoplasm of lower gum	K	Accepted
C039	Malignant neoplasm of gum, unspecified	None	Cannot group
C040	Malignant neoplasm of anterior floor of mouth	K	Accepted
C041	Malignant neoplasm of lateral floor of mouth	K	Accepted
C048	Malignant neoplasm of overlapping sites of floor of mouth	K	Accepted
C049	Malignant neoplasm of floor of mouth, unspecified	K	Accepted
C050	Malignant neoplasm of hard palate	K	Accepted
C051	Malignant neoplasm of soft palate	K	Accepted
C052	Malignant neoplasm of uvula	K	Accepted
C058	Malignant neoplasm of overlapping sites of palate	K	Accepted
C059	Malignant neoplasm of palate, unspecified	K	Accepted
C060	Malignant neoplasm of cheek mucosa	K	Accepted
C061	Malignant neoplasm of vestibule of mouth	K	Accepted
C062	Malignant neoplasm of retromolar area	K	Accepted
C0680	Malignant neoplasm of ovrlp sites of unsp parts of mouth	K	Accepted
C0689	Malignant neoplasm of overlapping sites of oth prt mouth	K	Accepted
C069	Malignant neoplasm of mouth, unspecified	None	Cannot group
C07	Malignant neoplasm of parotid gland	K	Accepted
C080	Malignant neoplasm of submandibular gland	K	Accepted
C081	Malignant neoplasm of sublingual gland	K	Accepted
C089	Malignant neoplasm of major salivary gland, unspecified	None	Cannot group
C090	Malignant neoplasm of tonsillar fossa	K	Accepted
C091	Malig neoplasm of tonsillar pillar (anterior) (posterior)	K	Accepted
C098	Malignant neoplasm of overlapping sites of tonsil	K	Accepted
C099	Malignant neoplasm of tonsil, unspecified	K	Accepted
C100	Malignant neoplasm of vallecula	K	Accepted
C101	Malignant neoplasm of anterior surface of epiglottis	K	Accepted
C102	Malignant neoplasm of lateral wall of oropharynx	K	Accepted
C103	Malignant neoplasm of posterior wall of oropharynx	K	Accepted
C104	Malignant neoplasm of branchial cleft	K	Accepted
C108	Malignant neoplasm of overlapping sites of oropharynx	K	Accepted
C109	Malignant neoplasm of oropharynx, unspecified	K	Accepted
C110	Malignant neoplasm of superior wall of nasopharynx	K	Accepted
C111	Malignant neoplasm of posterior wall of nasopharynx	K	Accepted
C112	Malignant neoplasm of lateral wall of nasopharynx	K	Accepted
C113	Malignant neoplasm of anterior wall of nasopharynx	K	Accepted
C118	Malignant neoplasm of overlapping sites of nasopharynx	K	Accepted
C119	Malignant neoplasm of nasopharynx, unspecified	K	Accepted
C12	Malignant neoplasm of pyriform sinus	K	Accepted
C130	Malignant neoplasm of postcricoid region	K	Accepted
C131	Malig neoplasm of aryepiglottic fold, hypopharyngeal aspect	K	Accepted
C132	Malignant neoplasm of posterior wall of hypopharynx	K	Accepted
C138	Malignant neoplasm of overlapping sites of hypopharynx	K	Accepted
C139	Malignant neoplasm of hypopharynx, unspecified	K	Accepted
C140	Malignant neoplasm of pharynx, unspecified	K	Accepted
C142	Malignant neoplasm of Waldeyer's ring	K	Accepted
C148	Malig neoplm of ovrlp sites of lip, oral cavity and pharynx	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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C00-C14 — Malignant neoplasms

Where these codes group

Every code in C00-C14

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