D71 ICD-10-CM Code: Functional disorders of polymorphonuclear neutrophils
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) / Other disorders of blood and blood-forming organs (D70-D77)
D71
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceFunctional disorders of polymorphonuclear neutrophils
Functional disorders of polymorphonuclear neutrophils
CMS-HCC V28
MappedHCC 115
RAF 0.565
CMS-HCC V24
MappedHCC 47
RAF 0.665
ACA/HHS
N/A—
Not mapped
ESRD/PACE
MappedHCC 47
RAF 0.078
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for D71 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for D71 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for D71 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for D71 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for D71 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for D71 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for D71 in this effective period.
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is D71 an HCC code?
Yes. D71 maps to Specified Immunodeficiencies and White Blood Cell Disorders under the CMS-HCC V28 risk adjustment model (and Disorders of Immunity under V24).
HCC Category Mapping
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 D71 in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for D71
For D71to 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 D71 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
D71 is the ICD-10-CM diagnosis code for functional disorders of polymorphonuclear neutrophils. D71 sits in the ICD-10-CM chapter for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (d50-d89), within the section covering other disorders of blood and blood-forming organs (d70-d77).
Under the CMS-HCC V28 risk adjustment model, D71 maps to Specified Immunodeficiencies and White Blood Cell Disorders (HCC 115) with a community, non-dual, aged base RAF weight of 0.565. Under the older CMS-HCC V24 model, D71 maps to Disorders of Immunity (HCC 47) with a community, non-dual, aged base RAF weight of 0.665. 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.
Header codes like D71 cannot be reported on claims directly, they organize child codes that share clinical context but the actual diagnosis must be coded to the highest level of specificity supported by the documentation. Coders should look at D71's child codes and select the one that matches the patient's documented presentation, since payers reject header codes submitted as the primary diagnosis. For risk adjustment workflows, header codes never contribute to a Medicare Advantage member's RAF score on their own; only billable child codes that happen to map to a payment HCC affect risk-adjusted plan payments.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for D71 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.