ICD-10 · PDGM grouping
C43-C44 — Melanoma and other malignant neoplasms of skin
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
149
No clinical group
37
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
112 of the 149 codes in C43-C44 group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. A further 37 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Every code in C43-C44
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| C430 | Malignant melanoma of lip | K | Accepted |
| C4310 | Malignant melanoma of unspecified eyelid, including canthus | None | Cannot group |
| C43111 | Malignant melanoma of right upper eyelid, including canthus | K | Accepted |
| C43112 | Malignant melanoma of right lower eyelid, including canthus | K | Accepted |
| C43121 | Malignant melanoma of left upper eyelid, including canthus | K | Accepted |
| C43122 | Malignant melanoma of left lower eyelid, including canthus | K | Accepted |
| C4320 | Malignant melanoma of unsp ear and external auricular canal | None | Cannot group |
| C4321 | Malignant melanoma of right ear and external auricular canal | K | Accepted |
| C4322 | Malignant melanoma of left ear and external auricular canal | K | Accepted |
| C4330 | Malignant melanoma of unspecified part of face | None | Cannot group |
| C4331 | Malignant melanoma of nose | K | Accepted |
| C4339 | Malignant melanoma of other parts of face | K | Accepted |
| C434 | Malignant melanoma of scalp and neck | K | Accepted |
| C4351 | Malignant melanoma of anal skin | K | Accepted |
| C4352 | Malignant melanoma of skin of breast | K | Accepted |
| C4359 | Malignant melanoma of other part of trunk | K | Accepted |
| C4360 | Malignant melanoma of unsp upper limb, including shoulder | None | Cannot group |
| C4361 | Malignant melanoma of right upper limb, including shoulder | K | Accepted |
| C4362 | Malignant melanoma of left upper limb, including shoulder | K | Accepted |
| C4370 | Malignant melanoma of unspecified lower limb, including hip | None | Cannot group |
| C4371 | Malignant melanoma of right lower limb, including hip | K | Accepted |
| C4372 | Malignant melanoma of left lower limb, including hip | K | Accepted |
| C438 | Malignant melanoma of overlapping sites of skin | K | Accepted |
| C439 | Malignant melanoma of skin, unspecified | None | Cannot group |
| C4400 | Unspecified malignant neoplasm of skin of lip | K | Accepted |
| C4401 | Basal cell carcinoma of skin of lip | K | Accepted |
| C4402 | Squamous cell carcinoma of skin of lip | K | Accepted |
| C4409 | Other specified malignant neoplasm of skin of lip | K | Accepted |
| C44101 | Unsp malignant neoplasm skin/ unsp eyelid, including canthus | None | Cannot group |
| C441021 | Unsp malig neoplasm skin/ right upper eyelid, inc canthus | K | Accepted |
| C441022 | Unsp malig neoplasm skin/ right lower eyelid, inc canthus | K | Accepted |
| C441091 | Unsp malignant neoplasm skin/ left upper eyelid, inc canthus | K | Accepted |
| C441092 | Unsp malignant neoplasm skin/ left lower eyelid, inc canthus | K | Accepted |
| C44111 | Basal cell carcinoma skin/ unsp eyelid, including canthus | None | Cannot group |
| C441121 | Basal cell carcinoma skin/ right upper eyelid, inc canthus | K | Accepted |
| C441122 | Basal cell carcinoma skin/ right lower eyelid, inc canthus | K | Accepted |
| C441191 | Basal cell carcinoma skin/ left upper eyelid, inc canthus | K | Accepted |
| C441192 | Basal cell carcinoma skin/ left lower eyelid, inc canthus | K | Accepted |
| C44121 | Squamous cell carcinoma skin/ unsp eyelid, including canthus | None | Cannot group |
| C441221 | Squamous cell carcinoma skin/ r upper eyelid, inc canthus | K | Accepted |
| C441222 | Squamous cell carcinoma skin/ right low eyelid, inc canthus | K | Accepted |
| C441291 | Squamous cell carcinoma skin/ left upper eyelid, inc canthus | K | Accepted |
| C441292 | Squamous cell carcinoma skin/ left lower eyelid, inc canthus | K | Accepted |
| C44131 | Sebaceous cell carcinoma skin/ unsplid, including canthus | None | Cannot group |
| C441321 | Sebaceous cell carcinoma skin/ r upper eyelid, inc canthus | K | Accepted |
| C441322 | Sebaceous cell carcinoma skin/ right low eyelid, inc canthus | K | Accepted |
| C441391 | Sebaceous cell carcinoma skin/ left upr eyelid, inc canthus | K | Accepted |
| C441392 | Sebaceous cell carcinoma skin/ left low eyelid, inc canthus | K | Accepted |
| C44191 | Oth malignant neoplasm skin/ unsp eyelid, including canthus | None | Cannot group |
| C441921 | Oth malignant neoplasm skin/ right upper eyelid, inc canthus | K | Accepted |
| C441922 | Oth malignant neoplasm skin/ right lower eyelid, inc canthus | K | Accepted |
| C441991 | Oth malignant neoplasm skin/ left upper eyelid, inc canthus | K | Accepted |
| C441992 | Oth malignant neoplasm skin/ left lower eyelid, inc canthus | K | Accepted |
| C44201 | Unsp malig neoplasm skin/ unsp ear and external auric canal | None | Cannot group |
| C44202 | Unsp malig neoplasm skin/ right ear and external auric canal | K | Accepted |
| C44209 | Unsp malig neoplasm skin/ left ear and external auric canal | K | Accepted |
| C44211 | Basal cell carcinoma skin/ unsp ear and external auric canal | None | Cannot group |
| C44212 | Basal cell carcinoma skin/ r ear and external auric canal | K | Accepted |
| C44219 | Basal cell carcinoma skin/ left ear and external auric canal | K | Accepted |
| C44221 | Squamous cell carcinoma skin/ unsp ear and extrn auric canal | None | Cannot group |
| C44222 | Squamous cell carcinoma skin/ r ear and external auric canal | K | Accepted |
| C44229 | Squamous cell carcinoma skin/ left ear and extrn auric canal | K | Accepted |
| C44291 | Oth malig neoplasm skin/ unsp ear and external auric canal | None | Cannot group |
| C44292 | Oth malig neoplasm skin/ right ear and external auric canal | K | Accepted |
| C44299 | Oth malig neoplasm skin/ left ear and external auric canal | K | Accepted |
| C44300 | Unsp malignant neoplasm of skin of unspecified part of face | None | Cannot group |
| C44301 | Unspecified malignant neoplasm of skin of nose | K | Accepted |
| C44309 | Unsp malignant neoplasm of skin of other parts of face | K | Accepted |
| C44310 | Basal cell carcinoma of skin of unspecified parts of face | None | Cannot group |
| C44311 | Basal cell carcinoma of skin of nose | K | Accepted |
| C44319 | Basal cell carcinoma of skin of other parts of face | K | Accepted |
| C44320 | Squamous cell carcinoma of skin of unspecified parts of face | None | Cannot group |
| C44321 | Squamous cell carcinoma of skin of nose | K | Accepted |
| C44329 | Squamous cell carcinoma of skin of other parts of face | K | Accepted |
| C44390 | Oth malignant neoplasm of skin of unspecified parts of face | None | Cannot group |
| C44391 | Other specified malignant neoplasm of skin of nose | K | Accepted |
| C44399 | Oth malignant neoplasm of skin of other parts of face | K | Accepted |
| C4440 | Unspecified malignant neoplasm of skin of scalp and neck | K | Accepted |
| C4441 | Basal cell carcinoma of skin of scalp and neck | K | Accepted |
| C4442 | Squamous cell carcinoma of skin of scalp and neck | K | Accepted |
| C4449 | Other specified malignant neoplasm of skin of scalp and neck | K | Accepted |
| C44500 | Unspecified malignant neoplasm of anal skin | K | Accepted |
| C44501 | Unspecified malignant neoplasm of skin of breast | K | Accepted |
| C44509 | Unsp malignant neoplasm of skin of other part of trunk | K | Accepted |
| C44510 | Basal cell carcinoma of anal skin | K | Accepted |
| C44511 | Basal cell carcinoma of skin of breast | K | Accepted |
| C44519 | Basal cell carcinoma of skin of other part of trunk | K | Accepted |
| C44520 | Squamous cell carcinoma of anal skin | K | Accepted |
| C44521 | Squamous cell carcinoma of skin of breast | K | Accepted |
| C44529 | Squamous cell carcinoma of skin of other part of trunk | K | Accepted |
| C44590 | Other specified malignant neoplasm of anal skin | K | Accepted |
| C44591 | Other specified malignant neoplasm of skin of breast | K | Accepted |
| C44599 | Oth malignant neoplasm of skin of other part of trunk | K | Accepted |
| C44601 | Unsp malignant neoplasm skin/ unsp upper limb, inc shoulder | None | Cannot group |
| C44602 | Unsp malignant neoplasm skin/ right upper limb, inc shoulder | K | Accepted |
| C44609 | Unsp malignant neoplasm skin/ left upper limb, inc shoulder | K | Accepted |
| C44611 | Basal cell carcinoma skin/ unsp upper limb, inc shoulder | None | Cannot group |
| C44612 | Basal cell carcinoma skin/ right upper limb, inc shoulder | K | Accepted |
| C44619 | Basal cell carcinoma skin/ left upper limb, inc shoulder | K | Accepted |
| C44621 | Squamous cell carcinoma skin/ unsp upper limb, inc shoulder | None | Cannot group |
| C44622 | Squamous cell carcinoma skin/ right upper limb, inc shoulder | K | Accepted |
| C44629 | Squamous cell carcinoma skin/ left upper limb, inc shoulder | K | Accepted |
| C44691 | Oth malignant neoplasm skin/ unsp upper limb, inc shoulder | None | Cannot group |
| C44692 | Oth malignant neoplasm skin/ right upper limb, inc shoulder | K | Accepted |
| C44699 | Oth malignant neoplasm skin/ left upper limb, inc shoulder | K | Accepted |
| C44701 | Unsp malignant neoplasm skin/ unsp lower limb, including hip | None | Cannot group |
| C44702 | Unsp malignant neoplasm skin/ right lower limb, inc hip | K | Accepted |
| C44709 | Unsp malignant neoplasm skin/ left lower limb, including hip | K | Accepted |
| C44711 | Basal cell carcinoma skin/ unsp lower limb, including hip | None | Cannot group |
| C44712 | Basal cell carcinoma skin/ right lower limb, including hip | K | Accepted |
| C44719 | Basal cell carcinoma skin/ left lower limb, including hip | K | Accepted |
| C44721 | Squamous cell carcinoma skin/ unsp lower limb, including hip | None | Cannot group |
| C44722 | Squamous cell carcinoma skin/ right lower limb, inc hip | K | Accepted |
| C44729 | Squamous cell carcinoma skin/ left lower limb, including hip | K | Accepted |
| C44791 | Oth malignant neoplasm skin/ unsp lower limb, including hip | None | Cannot group |
| C44792 | Oth malignant neoplasm skin/ right lower limb, including hip | K | Accepted |
| C44799 | Oth malignant neoplasm skin/ left lower limb, including hip | K | Accepted |
| C4480 | Unspecified malignant neoplasm of overlapping sites of skin | K | Accepted |
| C4481 | Basal cell carcinoma of overlapping sites of skin | K | Accepted |
| C4482 | Squamous cell carcinoma of overlapping sites of skin | K | Accepted |
| C4489 | Oth malignant neoplasm of overlapping sites of skin | K | Accepted |
| C4490 | Unspecified malignant neoplasm of skin, unspecified | None | Cannot group |
| C4491 | Basal cell carcinoma of skin, unspecified | None | Cannot group |
| C4492 | Squamous cell carcinoma of skin, unspecified | None | Cannot group |
| C4499 | Other specified malignant neoplasm of skin, unspecified | None | Cannot group |
| C4A0 | Merkel cell carcinoma of lip | K | Accepted |
| C4A10 | Merkel cell carcinoma of unsp eyelid, including canthus | None | Cannot group |
| C4A111 | Merkel cell carcinoma of right upper eyelid, inc canthus | K | Accepted |
| C4A112 | Merkel cell carcinoma of right lower eyelid, inc canthus | K | Accepted |
| C4A121 | Merkel cell carcinoma of left upper eyelid, inc canthus | K | Accepted |
| C4A122 | Merkel cell carcinoma of left lower eyelid, inc canthus | K | Accepted |
| C4A20 | Merkel cell carcinoma of unsp ear and external auric canal | None | Cannot group |
| C4A21 | Merkel cell carcinoma of right ear and external auric canal | K | Accepted |
| C4A22 | Merkel cell carcinoma of left ear and external auric canal | K | Accepted |
| C4A30 | Merkel cell carcinoma of unspecified part of face | None | Cannot group |
| C4A31 | Merkel cell carcinoma of nose | K | Accepted |
| C4A39 | Merkel cell carcinoma of other parts of face | K | Accepted |
| C4A4 | Merkel cell carcinoma of scalp and neck | K | Accepted |
| C4A51 | Merkel cell carcinoma of anal skin | K | Accepted |
| C4A52 | Merkel cell carcinoma of skin of breast | K | Accepted |
| C4A59 | Merkel cell carcinoma of other part of trunk | K | Accepted |
| C4A60 | Merkel cell carcinoma of unsp upper limb, including shoulder | None | Cannot group |
| C4A61 | Merkel cell carcinoma of right upper limb, inc shoulder | K | Accepted |
| C4A62 | Merkel cell carcinoma of left upper limb, including shoulder | K | Accepted |
| C4A70 | Merkel cell carcinoma of unsp lower limb, including hip | None | Cannot group |
| C4A71 | Merkel cell carcinoma of right lower limb, including hip | K | Accepted |
| C4A72 | Merkel cell carcinoma of left lower limb, including hip | K | Accepted |
| C4A8 | Merkel cell carcinoma of overlapping sites | K | Accepted |
| C4A9 | Merkel cell carcinoma, unspecified | None | Cannot group |
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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