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C93.10 ICD-10-CM Code: Chronic myelomonocytic leukemia not having achieved remission

C93.10 maps to CMS-HCC V28 20. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC Buddy coding tools

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Code lookupC93.10

FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)

C93.10

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Chronic myelomonocytic leukemia not having achieved remission

A chronic blood cancer affecting monocyte and myeloid cells that has not achieved remission.

Buddy the Bee presenting code insight

Buddy Insight

Chronic myelomonocytic leukemia not having achieved remission is a clonal hematopoietic stem cell disorder classified as a myelodysplastic/myeloproliferative overlap syndrome.

OverviewRisk ModelsCode BookDocumentationAuditNotesEdition comparison

CMS-HCC V28

HCC 20

Coefficient HCC 20: 1.136 (Community Non-Dual Aged (CNA))

CMS-HCC V24

Historical

Historical

Not used for CY2026 payment

ACA/HHS

HCC 009

Code-level coefficient reference

ESRD/PACE

HCC 9

Code-level coefficient reference

RXHCC

HCC 19

Code-level coefficient reference

Code Book Path

Official
C93Monocytic leukemiaC93.1Chronic myelomonocytic leukemiaC93.10Chronic myelomonocytic leukemia not having achieved remission

Inclusion Terms

Official
  • Chronic myelomonocytic leukemia with failed remission
  • Chronic myelomonocytic leukemia NOS
  • Chronic monocytic leukemiaInherited from C93.1
  • CMML-1Inherited from C93.1
  • CMML-2Inherited from C93.1
  • CMML with eosinophiliaInherited from C93.1

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

Official
C93.11Chronic myelomonocytic leukemia, in remissionC93.12Chronic myelomonocytic leukemia, in relapse

Includes

Official
  • monocytoid leukemiaInherited from C93

Excludes 1

Official
  • personal history of leukemia (Z85.6)Inherited from C93

Code First

Official

No Code First sequencing instructions are included in this display for C93.10. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for C93.10. Check the code and parent instructions in the Code Book.

Code Also

Official
  • , if applicable, eosinophilia (D72.18)Inherited from C93.1

Buddy Documentation Tip

HCC Buddy guidance
Documentation should include persistent monocytosis for at least 3 months, bone marrow findings showing dysplasia in one or more myeloid lineages, and absence of Philadelphia chromosome or BCR-ABL1 fusion gene.
Treatment status and response must confirm that remission has not been achieved.

MEAT Support

HCC Buddy guidance
Documentation should include persistent monocytosis for at least 3 months, bone marrow findings showing dysplasia in one or more myeloid lineages, and absence of Philadelphia chromosome or BCR-ABL1 fusion gene.
Treatment status and response must confirm that remission has not been achieved.

Audit Caution

HCC Buddy guidance
Do not confuse chronic myelomonocytic leukemia with chronic myeloid leukemia
they are genetically and clinically distinct entities. If the disease transforms to acute leukemia (blast count exceeds 20%), the code should be changed to an acute leukemia code. Reactive monocytosis from infection should not be coded as leukemia.

Common Mistakes

HCC Buddy guidance
C93.00 (acute monoblastic/monocytic leukemia) is the acute form with a much more aggressive course.
D46.9 (myelodysplastic syndrome, unspecified) lacks the monocytic proliferative component.
C92.10 (chronic myeloid leukemia) is BCR-ABL1 positive, while chronic myelomonocytic leukemia is BCR-ABL1 negative.

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 C93.10 an HCC code?

Yes. C93.10 (Chronic myelomonocytic leukemia not having achieved remission) maps to HCC 20, Lung and Other Severe Cancers under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 1.136. 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: C93.10 is billable and maps to V28 HCC 20, Lung and Other Severe Cancers. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
C93.10
Description
Chronic myelomonocytic leukemia not having achieved remission
HCC (V28)
HCC 20 — Lung and Other Severe Cancers
RAF reference coefficient
1.136
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 20, Lung and Other Severe Cancers
1.136
ESRDHCC 9, Lung and Other Severe Cancers
Not separately weighted
RxHCCHCC 19, Leukemias and Other Hematologic Cancers
Not separately weighted

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 C93.10 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C93.10

For C93.10, 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

C93.10 is the ICD-10-CM diagnosis code for chronic myelomonocytic leukemia not having achieved remission. A chronic blood cancer affecting monocyte and myeloid cells that has not achieved remission. C93.10 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, C93.10 maps to Lung and Other Severe Cancers (HCC 20) with a source-labeled community, non-dual, aged reference coefficient of 1.136. No V24 mapping is shown for C93.10; use the applicable model and payment year when reviewing the V28 mapping. 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.

C93.1 indicates chronic myelomonocytic leukemia (CMML), a distinct entity from acute monocytic leukemia. For C93.10, 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 C93.10 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •C93.1 indicates chronic myelomonocytic leukemia (CMML), a distinct entity from acute monocytic leukemia
  • •The '0' suffix means no remission; document the chronic nature and current disease burden

Clinical Significance

Chronic myelomonocytic leukemia not having achieved remission is a clonal hematopoietic stem cell disorder classified as a myelodysplastic/myeloproliferative overlap syndrome. It is characterized by persistent peripheral blood monocytosis greater than 1,000/microL and carries a risk of transformation to acute myeloid leukemia in approximately 15-30% of cases.

Documentation Requirements

  • ✓Documentation should include persistent monocytosis for at least 3 months, bone marrow findings showing dysplasia in one or more myeloid lineages, and absence of Philadelphia chromosome or BCR-ABL1 fusion gene.
  • ✓Treatment status and response must confirm that remission has not been achieved.

Commonly Confused Codes

  • •C93.00 (acute monoblastic/monocytic leukemia) is the acute form with a much more aggressive course.
  • •D46.9 (myelodysplastic syndrome, unspecified) lacks the monocytic proliferative component.
  • •C92.10 (chronic myeloid leukemia) is BCR-ABL1 positive, while chronic myelomonocytic leukemia is BCR-ABL1 negative.

Child Codes

C93.10Chronic myelomonocytic leukemia not having achieved remission
HCC 20
C93.11Chronic myelomonocytic leukemia, in remission
HCC 20
C93.12Chronic myelomonocytic leukemia, in relapse
HCC 20

Code Hierarchy

└C93Monocytic leukemia└C93.1Chronic myelomonocytic leukemia└C93.10Chronic myelomonocytic leukemia not having achieved remission
└C93.10Chronic myelomonocytic leukemia not having achieved remission

Also searched as

  • C93 10
  • C9310

For C93.10, 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.

C93.10 maps to CMS-HCC V28 category 20, Lung and Other Severe Cancers. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. The mapping identifies a payment HCC category for C93.10. Review its source-labeled HCC coefficient above, check the RAF Calculator with complete member context for CMS-HCC V28 PY2026, and confirm the documentation the chart needs before the code is submitted. HCC Buddy shows no RAF score unless every required source and calculation check passes.

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