What is ICD-10 code D47.9?

D47.9 is the ICD-10-CM diagnosis code for Neoplasm of uncertain behavior of lymphoid, hematopoietic and related tissue, unspecified. It belongs to the ICD-10-CM chapter for neoplasms (c00-d49). D47.9 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. D47.9 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. D47.9 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. D47.9 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does D47.9 map to under V28?

D47.9 maps to CMS-HCC V28 21 (Lymphoma and Other Cancers). The category number and label come from the CMS-HCC V28 model file for payment year 2026.

What does D47.9 pay in RAF?

D47.9 carries a community, non-dual, aged (CNA) RAF weight of 0.671 under CMS-HCC V28 for payment year 2026. The weight comes from the CMS V28 relative-factor file, not a hand-typed table.

What is the V28 vs V24 difference for D47.9?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. For D47.9, V28 maps to Lymphoma and Other Cancers at RAF 0.671 while V24 mapped to Coagulation Defects and Other Specified Hematological Disorders at RAF 0.192. Both models can still appear in legacy data and in payer-specific lookback periods.

What documentation supports D47.9?

Use this code only when the pathology report explicitly states 'uncertain behavior' or when the specific type of lymphoid/hematopoietic neoplasm cannot be determined; avoid using this as a default code if more specific information is available Query the physician or pathology report if a more specific D47.x code (such as D47.1 for chronic myeloproliferative disease or D47.2 for monoclonal neoplasm) can be assigned, as unspecified codes should be used minimally in modern coding practice Because D47.9 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM D47.9: Neoplasm of uncertain

D47.9 maps to CMS-HCC V28 21 (RAF 0.671). Documentation must support MEAT. MEAT criteria · RAF calculator · free HCC coding tools

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupD47.9Effective 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)

D47.9

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

Neoplasm of uncertain behavior of lymphoid, hematopoietic and related tissue, unspecified

This code describes an abnormal growth in blood-forming tissues or lymph tissues that cannot be definitively classified as either cancer or a benign (non-cancerous) condition at the time of diagnosis. It is used when the exact nature of the growth remains uncertain or unspecified.

Buddy Insight

This unspecified code represents neoplasms of uncertain behavior involving lymphoid, hematopoietic, or related tissues when the specific entity cannot be determined.

CMS-HCC V28

Mapped

HCC 21

Lymphoma and Other Cancers

RAF 0.671

CMS-HCC V24

Mapped

HCC 48

Coagulation Defects and Other...

RAF 0.192

ACA/HHS

Mapped

HCC 75

HHS-HCC 75

Varies by metal level

ESRD/PACE

Mapped

HCC 48

Coagulation Defects and Other...

RAF 0.063

RXHCC

Mapped

HCC 21

Hodgkin Lymphoma and Other Ca...

RAF 0.410

Code Book Path

Official

D47Other neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue

D47.9Neoplasm of uncertain behavior of lymphoid, hematopoietic and related tissue, unspecified

Inclusion Terms

Official

Lymphoproliferative disease NOS

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for D47.9 in this effective period.

Related Child Codes

Official

D47.0Mast cell neoplasms of uncertain behavior

D47.1Chronic myeloproliferative disease

D47.2Monoclonal gammopathy

D47.3Essential (hemorrhagic) thrombocythemia

D47.4Osteomyelofibrosis

Includes

Official

ICD-10-CM does not list Includes notes for D47.9 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for D47.9 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for D47.9 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for D47.9 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for D47.9 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Use this code only when documentation confirms a neoplasm of uncertain behavior in lymphoid or hematopoietic tissue but cannot identify the specific subtype.

Initiate a provider query for bone marrow biopsy findings, flow cytometry results, cytogenetic analysis, and molecular testing.

Document the clinical presentation and any prior hematologic workup.

MEAT Support

HCC Buddy guidance

Use this code only when documentation confirms a neoplasm of uncertain behavior in lymphoid or hematopoietic tissue but cannot identify the specific subtype.

Initiate a provider query for bone marrow biopsy findings, flow cytometry results, cytogenetic analysis, and molecular testing.

Document the clinical presentation and any prior hematologic workup.

Audit Caution

HCC Buddy guidance

Always attempt to identify the specific hematologic neoplasm before using this unspecified code.

Modern hematopathology provides specific diagnoses through flow cytometry, cytogenetics, and molecular testing.

This code may trigger payer queries and should prompt provider engagement for additional diagnostic information.

Common Mistakes

HCC Buddy guidance

D47.1 (chronic myeloproliferative disease), D47.3 (essential thrombocythemia), and D47.Z1-D47.Z2 are more specific codes within this category.

D46.9 (myelodysplastic syndrome, unspecified) covers a different category of bone marrow disorders.

C85.90 (non-Hodgkin lymphoma, unspecified) is used for confirmed malignant lymphoid neoplasms.

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 D47.9 an HCC code?

Yes. D47.9 (Neoplasm of uncertain behavior of lymphoid, hematopoietic and related tissue, unspecified) maps to Lymphoma and Other Cancers under the CMS-HCC V28 risk adjustment model (and Coagulation Defects and Other Specified Hematological Disorders under V24), with a community non-dual aged RAF of 0.671. It is billable for payment year 2026.

Coder answer: D47.9 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: D47.9
Description: Neoplasm of uncertain behavior of lymphoid, hematopoietic and related tissue, unspecified
HCC (V28): HCC 21 — Lymphoma and Other Cancers
RAF: 0.671
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 21, Lymphoma and Other Cancers

0.671

V24HCC 48, Coagulation Defects and Other Specified Hematological Disorders

0.192

ESRDHCC 48, Coagulation Defects and Other Specified Hematological Disorders

0.063

RxHCCHCC 21, Hodgkin Lymphoma and Other Cancers

0.410

Each model's RAF is its CMS base weight for that model's standard population, so 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 segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work D47.9 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for D47.9

For D47.9 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

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

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed D47.9 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

D47.9 is the ICD-10-CM diagnosis code for neoplasm of uncertain behavior of lymphoid, hematopoietic and related tissue, unspecified. This code describes an abnormal growth in blood-forming tissues or lymph tissues that cannot be definitively classified as either cancer or a benign (non-cancerous) condition at the time of diagnosis. It is used when the exact nature of the growth remains uncertain or unspecified. D47.9 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, D47.9 maps to Lymphoma and Other Cancers (HCC 21) with a community, non-dual, aged base RAF weight of 0.671. Under the older CMS-HCC V24 model, D47.9 maps to Coagulation Defects and Other Specified Hematological Disorders (HCC 48) with a community, non-dual, aged base RAF weight of 0.192. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Use this code only when the pathology report explicitly states 'uncertain behavior' or when the specific type of lymphoid/hematopoietic neoplasm cannot be determined; avoid using this as a default code if more specific information is available. Because D47.9 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, and MEAT documentation criteria for D47.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when the pathology report explicitly states 'uncertain behavior' or when the specific type of lymphoid/hematopoietic neoplasm cannot be determined; avoid using this as a default code if more specific information is available
•Query the physician or pathology report if a more specific D47.x code (such as D47.1 for chronic myeloproliferative disease or D47.2 for monoclonal neoplasm) can be assigned, as unspecified codes should be used minimally in modern coding practice

Clinical Significance

This unspecified code represents neoplasms of uncertain behavior involving lymphoid, hematopoietic, or related tissues when the specific entity cannot be determined. These conditions involve clonal proliferations with uncertain malignant potential that require specialized hematopathology evaluation for definitive classification and risk stratification.

Documentation Requirements

✓Use this code only when documentation confirms a neoplasm of uncertain behavior in lymphoid or hematopoietic tissue but cannot identify the specific subtype.
✓Initiate a provider query for bone marrow biopsy findings, flow cytometry results, cytogenetic analysis, and molecular testing.
✓Document the clinical presentation and any prior hematologic workup.

Commonly Confused Codes

•D47.1 (chronic myeloproliferative disease), D47.3 (essential thrombocythemia), and D47.Z1-D47.Z2 are more specific codes within this category.
•D46.9 (myelodysplastic syndrome, unspecified) covers a different category of bone marrow disorders.
•C85.90 (non-Hodgkin lymphoma, unspecified) is used for confirmed malignant lymphoid neoplasms.