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 v07.2.26.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in range
65
No clinical group
6
A period cannot be grouped from these.
Barred as primary
0
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.
Code families in C00-C14
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- C00Malignant neoplasm of lip9 codes
- C01Malignant neoplasm of base of tongue1 code
- C02Malignant neoplasm of other and unspecified parts of tongue7 codes
- C03Malignant neoplasm of gum3 codes
- C04Malignant neoplasm of floor of mouth4 codes
- C05Malignant neoplasm of palate5 codes
- C06Malignant neoplasm of other and unspecified parts of mouth6 codes
- C07Malignant neoplasm of parotid gland1 code
- C08Malignant neoplasm of other and unspecified major salivary glands3 codes
- C09Malignant neoplasm of tonsil4 codes
- C10Malignant neoplasm of oropharynx7 codes
- C11Malignant neoplasm of nasopharynx6 codes
- C12Malignant neoplasm of pyriform sinus1 code
- C13Malignant neoplasm of hypopharynx5 codes
- C14Malignant neoplasm of other and ill-defined sites in the lip, oral cavity and pharynx3 codes
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 | Can lead a claim |
| C001 | Malignant neoplasm of external lower lip | K | Can lead a claim |
| C002 | Malignant neoplasm of external lip, unspecified | None | Cannot lead a claim |
| C003 | Malignant neoplasm of upper lip, inner aspect | K | Can lead a claim |
| C004 | Malignant neoplasm of lower lip, inner aspect | K | Can lead a claim |
| C005 | Malignant neoplasm of lip, unspecified, inner aspect | None | Cannot lead a claim |
| C006 | Malignant neoplasm of commissure of lip, unspecified | K | Can lead a claim |
| C008 | Malignant neoplasm of overlapping sites of lip | K | Can lead a claim |
| C009 | Malignant neoplasm of lip, unspecified | None | Cannot lead a claim |
| C01 | Malignant neoplasm of base of tongue | K | Can lead a claim |
| C020 | Malignant neoplasm of dorsal surface of tongue | K | Can lead a claim |
| C021 | Malignant neoplasm of border of tongue | K | Can lead a claim |
| C022 | Malignant neoplasm of ventral surface of tongue | K | Can lead a claim |
| C023 | Malig neoplasm of anterior two-thirds of tongue, part unsp | K | Can lead a claim |
| C024 | Malignant neoplasm of lingual tonsil | K | Can lead a claim |
| C028 | Malignant neoplasm of overlapping sites of tongue | K | Can lead a claim |
| C029 | Malignant neoplasm of tongue, unspecified | K | Can lead a claim |
| C030 | Malignant neoplasm of upper gum | K | Can lead a claim |
| C031 | Malignant neoplasm of lower gum | K | Can lead a claim |
| C039 | Malignant neoplasm of gum, unspecified | None | Cannot lead a claim |
| C040 | Malignant neoplasm of anterior floor of mouth | K | Can lead a claim |
| C041 | Malignant neoplasm of lateral floor of mouth | K | Can lead a claim |
| C048 | Malignant neoplasm of overlapping sites of floor of mouth | K | Can lead a claim |
| C049 | Malignant neoplasm of floor of mouth, unspecified | K | Can lead a claim |
| C050 | Malignant neoplasm of hard palate | K | Can lead a claim |
| C051 | Malignant neoplasm of soft palate | K | Can lead a claim |
| C052 | Malignant neoplasm of uvula | K | Can lead a claim |
| C058 | Malignant neoplasm of overlapping sites of palate | K | Can lead a claim |
| C059 | Malignant neoplasm of palate, unspecified | K | Can lead a claim |
| C060 | Malignant neoplasm of cheek mucosa | K | Can lead a claim |
| C061 | Malignant neoplasm of vestibule of mouth | K | Can lead a claim |
| C062 | Malignant neoplasm of retromolar area | K | Can lead a claim |
| C0680 | Malignant neoplasm of ovrlp sites of unsp parts of mouth | K | Can lead a claim |
| C0689 | Malignant neoplasm of overlapping sites of oth prt mouth | K | Can lead a claim |
| C069 | Malignant neoplasm of mouth, unspecified | None | Cannot lead a claim |
| C07 | Malignant neoplasm of parotid gland | K | Can lead a claim |
| C080 | Malignant neoplasm of submandibular gland | K | Can lead a claim |
| C081 | Malignant neoplasm of sublingual gland | K | Can lead a claim |
| C089 | Malignant neoplasm of major salivary gland, unspecified | None | Cannot lead a claim |
| C090 | Malignant neoplasm of tonsillar fossa | K | Can lead a claim |
| C091 | Malig neoplasm of tonsillar pillar (anterior) (posterior) | K | Can lead a claim |
| C098 | Malignant neoplasm of overlapping sites of tonsil | K | Can lead a claim |
| C099 | Malignant neoplasm of tonsil, unspecified | K | Can lead a claim |
| C100 | Malignant neoplasm of vallecula | K | Can lead a claim |
| C101 | Malignant neoplasm of anterior surface of epiglottis | K | Can lead a claim |
| C102 | Malignant neoplasm of lateral wall of oropharynx | K | Can lead a claim |
| C103 | Malignant neoplasm of posterior wall of oropharynx | K | Can lead a claim |
| C104 | Malignant neoplasm of branchial cleft | K | Can lead a claim |
| C108 | Malignant neoplasm of overlapping sites of oropharynx | K | Can lead a claim |
| C109 | Malignant neoplasm of oropharynx, unspecified | K | Can lead a claim |
| C110 | Malignant neoplasm of superior wall of nasopharynx | K | Can lead a claim |
| C111 | Malignant neoplasm of posterior wall of nasopharynx | K | Can lead a claim |
| C112 | Malignant neoplasm of lateral wall of nasopharynx | K | Can lead a claim |
| C113 | Malignant neoplasm of anterior wall of nasopharynx | K | Can lead a claim |
| C118 | Malignant neoplasm of overlapping sites of nasopharynx | K | Can lead a claim |
| C119 | Malignant neoplasm of nasopharynx, unspecified | K | Can lead a claim |
| C12 | Malignant neoplasm of pyriform sinus | K | Can lead a claim |
| C130 | Malignant neoplasm of postcricoid region | K | Can lead a claim |
| C131 | Malig neoplasm of aryepiglottic fold, hypopharyngeal aspect | K | Can lead a claim |
| C132 | Malignant neoplasm of posterior wall of hypopharynx | K | Can lead a claim |
| C138 | Malignant neoplasm of overlapping sites of hypopharynx | K | Can lead a claim |
| C139 | Malignant neoplasm of hypopharynx, unspecified | K | Can lead a claim |
| C140 | Malignant neoplasm of pharynx, unspecified | K | Can lead a claim |
| C142 | Malignant neoplasm of Waldeyer's ring | K | Can lead a claim |
| C148 | Malig neoplm of ovrlp sites of lip, oral cavity and pharynx | K | Can lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. 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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