D47.Z9 maps to CMS-HCC V28 21. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupD47.Z9

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Neoplasms (C00-D49) / Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (D37-D48)

D47.Z9

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

Other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue

Other abnormal growths of blood and lymphoid tissue that have uncertain potential to become cancer and don't fit into other specific categories.

Buddy Insight

This code captures neoplasms of uncertain behavior in lymphoid and hematopoietic tissue that defy more specific classification within the D47 series.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 21

Lymphoma and Other Cancers

Coefficient HCC 21: 0.671 (Community Non-Dual Aged (CNA))

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 075

HHS-HCC 075 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 48

Coagulation Defects and Other...

Code-level coefficient reference

RXHCC

Mapped

HCC 21

Lymphomas and Other Hematolog...

Code-level coefficient reference

Code Book Path

Official

D47Other neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue D47.ZOther specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue D47.Z9Other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue

Inclusion Terms

Official

Histiocytic tumors of uncertain behavior

Excludes 2

Official

No Excludes 2 notes are included in this display for D47.Z9. Check the code and parent instructions in the Code Book.

Related Codes

Official

D47.Z1Post-transplant lymphoproliferative disorder (PTLD)D47.Z2Castleman disease

Includes

Official

No Includes notes are included in this display for D47.Z9. Check the code and parent instructions in the Code Book.

Excludes 1

Official

neoplasms of unspecified behavior (D49.-)Inherited from D37-D48

Code First

Official

No Code First sequencing instructions are included in this display for D47.Z9. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for D47.Z9. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for D47.Z9. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Documentation must include the pathologic diagnosis with histologic findings supporting uncertain behavior classification, the anatomic site or tissue type involved, and the basis for excluding more specific D47 subcategories.

Include biopsy or bone marrow results, flow cytometry findings, and current treatment or monitoring plan.

Provider attestation of ongoing clinical relevance each encounter is required for recapture.

MEAT Support

HCC Buddy guidance

Include biopsy or bone marrow results, flow cytometry findings, and current treatment or monitoring plan.

Provider attestation of ongoing clinical relevance each encounter is required for recapture.

Audit Caution

HCC Buddy guidance

Do not use D47.Z9 as a default when documentation supports a more specific D47 code such as D47.01 (Cutaneous mastocytosis) or D47.4 (Osteomyelofibrosis).

Avoid coding this when the pathology report confirms benign or malignant behavior.

This code drops out of V28 HCC mapping, so ensure the condition still qualifies under active V24 models for risk adjustment capture.

Common Mistakes

HCC Buddy guidance

D47.Z9 vs. D47.1 (Chronic myeloproliferative disease) -

use D47.1 when a specific myeloproliferative neoplasm is diagnosed. D47.Z9 vs. C96.9 (Malignant neoplasm of lymphoid/hematopoietic tissue, unspecified) -

use C96.9 when behavior is confirmed malignant. D47.Z9 vs. D75.89 (Other specified diseases of blood) -

D75.89 is for non-neoplastic hematologic disorders.

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 D47.Z9 an HCC code?

Yes. D47.Z9 (Other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue) maps to HCC 21, Lymphoma and Other Cancers under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.671. 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: D47.Z9 is billable and maps to V28 HCC 21, Lymphoma and Other Cancers. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: D47.Z9
Description: Other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue
HCC (V28): HCC 21 — Lymphoma and Other Cancers
RAF reference coefficient: 0.671
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 21, Lymphoma and Other Cancers

0.671

ESRDHCC 48, Coagulation Defects and Other Specified Hematological Disorders

Not separately weighted

RxHCCHCC 21, Lymphomas 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 D47.Z9 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for D47.Z9

For D47.Z9, 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

D47.Z9 is the ICD-10-CM diagnosis code for other specified neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue. Other abnormal growths of blood and lymphoid tissue that have uncertain potential to become cancer and don't fit into other specific categories. D47.Z9 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (d37-d48).

Under the CMS-HCC V28 risk adjustment model, D47.Z9 maps to Lymphoma and Other Cancers (HCC 21) with a source-labeled community, non-dual, aged reference coefficient of 0.671. 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.

This is a catch-all code; use only when a more specific code from D47 series is not applicable. For D47.Z9, 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 D47.Z9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This is a catch-all code; use only when a more specific code from D47 series is not applicable
•Document the specific diagnosis and pathologic findings that support the uncertain behavior classification

Clinical Significance

This code captures neoplasms of uncertain behavior in lymphoid and hematopoietic tissue that defy more specific classification within the D47 series. These conditions represent clonal hematologic processes where the biological behavior -- whether indolent or aggressive -- remains undetermined, requiring close hematologic surveillance. Accurate capture is critical because misclassifying these as benign or definitively malignant alters treatment planning and risk stratification.

Documentation Requirements

✓Documentation must include the pathologic diagnosis with histologic findings supporting uncertain behavior classification, the anatomic site or tissue type involved, and the basis for excluding more specific D47 subcategories.
✓Include biopsy or bone marrow results, flow cytometry findings, and current treatment or monitoring plan.
✓Provider attestation of ongoing clinical relevance each encounter is required for recapture.

Commonly Confused Codes

•D47.Z9 vs. D47.1 (Chronic myeloproliferative disease) -
•use D47.1 when a specific myeloproliferative neoplasm is diagnosed. D47.Z9 vs. C96.9 (Malignant neoplasm of lymphoid/hematopoietic tissue, unspecified) -
•use C96.9 when behavior is confirmed malignant. D47.Z9 vs. D75.89 (Other specified diseases of blood) -
•D75.89 is for non-neoplastic hematologic disorders.