C93.00 ICD-10-CM Code: Acute monoblastic/monocytic leukemia, not having achieved remission
C93.00 maps to CMS-HCC V28 17. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
C93.00
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAcute monoblastic/monocytic leukemia, not having achieved remission
An acute blood cancer affecting monocyte-forming cells in the bone marrow that has not responded to treatment.
Buddy Insight
Acute monoblastic/monocytic leukemia not having achieved remission is an aggressive subtype of acute myeloid leukemia where malignant monocyte precursors proliferate in the bone marrow.
CMS-HCC V28
MappedHCC 17
Coefficient HCC 17: 4.209 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 008
Code-level coefficient reference
ESRD/PACE
MappedHCC 8
Code-level coefficient reference
RXHCC
MappedHCC 19
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Acute monoblastic/monocytic leukemia with failed remission
- Acute monoblastic/monocytic leukemia NOS
- AML M5Inherited from C93.0
- AML M5aInherited from C93.0
- AML M5bInherited from C93.0
Excludes 2
Official- Kaposi's sarcoma of lymph nodes (C46.3)Inherited from C81-C96
- secondary and unspecified neoplasm of lymph nodes (C77.-)Inherited from C81-C96
- secondary neoplasm of bone marrow (C79.52)Inherited from C81-C96
- secondary neoplasm of spleen (C78.89)Inherited from C81-C96
Related Codes
Includes
Official- monocytoid leukemiaInherited from C93
Excludes 1
Official- personal history of leukemia (Z85.6)Inherited from C93
Code First
OfficialNo Code First sequencing instructions are included in this display for C93.00. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for C93.00. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for C93.00. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is C93.00 an HCC code?
Yes. C93.00 (Acute monoblastic/monocytic leukemia, not having achieved remission) maps to HCC 17, Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 4.209. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.
Coder answer: C93.00 is billable and maps to V28 HCC 17, Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- C93.00
- Description
- Acute monoblastic/monocytic leukemia, not having achieved remission
- HCC (V28)
- HCC 17 — Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic
- RAF reference coefficient
- 4.209
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work C93.00 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for C93.00
For C93.00, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Coder workflow notes
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What This Code Means
C93.00 is the ICD-10-CM diagnosis code for acute monoblastic/monocytic leukemia, not having achieved remission. An acute blood cancer affecting monocyte-forming cells in the bone marrow that has not responded to treatment. C93.00 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of lymphoid, hematopoietic and related tissue (c81-c96).
Under the CMS-HCC V28 risk adjustment model, C93.00 maps to Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic (HCC 17) with a source-labeled community, non-dual, aged reference coefficient of 4.209. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.
C93.0 specifically indicates acute monoblastic or monocytic leukemia; distinguish from chronic monocytic leukemia (C93.1). For C93.00, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for C93.00 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
Clinical Significance
Acute monoblastic/monocytic leukemia not having achieved remission is an aggressive subtype of acute myeloid leukemia where malignant monocyte precursors proliferate in the bone marrow. This subtype (formerly French-American-British classification M5) is often associated with extramedullary tissue involvement, gingival hyperplasia, and disseminated intravascular coagulation.
Documentation Requirements
- ✓Pathology must confirm the monoblastic or monocytic nature of the leukemic cells through morphology, immunophenotyping, or flow cytometry.
- ✓Treatment history must document that remission has not been achieved, including specific induction regimens attempted and current disease status with blast counts.