ICD-10 · PDGM grouping
C91 Lymphoid leukemia
All 27 codes in the C91 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
27
Can lead a claim
27
Cannot lead a claim
0
What CMS assigns to C91
All 27 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. All 27 count toward the Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia comorbidity subgroup. Every code can lead a claim.
- Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia
Every code in C91
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| C91.0 Acute lymphoblastic leukemia [ALL] | ||||
| C91.00 | Acute lymphoblastic leukemia not having achieved remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.01 | Acute lymphoblastic leukemia, in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.02 | Acute lymphoblastic leukemia, in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.1 Chronic lymphocytic leukemia of B-cell type | ||||
| C91.10 | Chronic lymphocytic leukemia of B-cell type not having achieved remissionCMS: Chronic lymphocytic leuk of B-cell type not achieve remis | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.11 | Chronic lymphocytic leukemia of B-cell type in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.12 | Chronic lymphocytic leukemia of B-cell type in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.3 Prolymphocytic leukemia of B-cell type | ||||
| C91.30 | Prolymphocytic leukemia of B-cell type not having achieved remissionCMS: Prolymphocytic leukemia of B-cell type not achieve remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.31 | Prolymphocytic leukemia of B-cell type, in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.32 | Prolymphocytic leukemia of B-cell type, in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.4 Hairy cell leukemia | ||||
| C91.40 | Hairy cell leukemia not having achieved remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.41 | Hairy cell leukemia, in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.42 | Hairy cell leukemia, in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.5 Adult T-cell lymphoma/leukemia (HTLV-1-associated) | ||||
| C91.50 | Adult T-cell lymphoma/leukemia (HTLV-1-associated) not having achieved remissionCMS: Adult T-cell lymph/leuk (HTLV-1-assoc) not achieve remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.51 | Adult T-cell lymphoma/leukemia (HTLV-1-associated), in remissionCMS: Adult T-cell lymphoma/leukemia (HTLV-1-assoc), in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.52 | Adult T-cell lymphoma/leukemia (HTLV-1-associated), in relapseCMS: Adult T-cell lymphoma/leukemia (HTLV-1-assoc), in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.6 Prolymphocytic leukemia of T-cell type | ||||
| C91.60 | Prolymphocytic leukemia of T-cell type not having achieved remissionCMS: Prolymphocytic leukemia of T-cell type not achieve remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.61 | Prolymphocytic leukemia of T-cell type, in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.62 | Prolymphocytic leukemia of T-cell type, in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.A Mature B-cell leukemia Burkitt-type | ||||
| C91.A0 | Mature B-cell leukemia Burkitt-type not having achieved remissionCMS: Mature B-cell leukemia Burkitt-type not achieve remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.A1 | Mature B-cell leukemia Burkitt-type, in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.A2 | Mature B-cell leukemia Burkitt-type, in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.Z Other lymphoid leukemia | ||||
| C91.Z0 | Other lymphoid leukemia not having achieved remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.Z1 | Other lymphoid leukemia, in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.Z2 | Other lymphoid leukemia, in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.9 Lymphoid leukemia, unspecified | ||||
| C91.90 | Lymphoid leukemia, unspecified not having achieved remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.91 | Lymphoid leukemia, unspecified, in remission | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
| C91.92 | Lymphoid leukemia, unspecified, in relapse | Can lead a claim | K | Follicular and Other Non-Hodgkin’s Lymphoma, and Leukemia |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. 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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