2026 ICD-10-CM Diagnosis Code D71.9
Functional disorders of polymorphonuclear neutrophils, unspecified
- ICD-10-CM Code:
- D71.9
- ICD-10 Code for:
- Functional disorders of polymorphonuclear neutrophils, unsp
- Is Billable?
- Yes - Valid for Submission
- Code Navigator:
D71.9 is a billable diagnosis code used to specify a medical diagnosis of functional disorders of polymorphonuclear neutrophils, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.
Unspecified diagnosis codes like D71.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.
Approximate Synonyms
The following list of clinical terms are approximate synonyms, alternative descriptions, or common phrases that might be used by patients, healthcare providers, or medical coders to describe the same condition. These synonyms and related diagnosis terms are often used when searching for an ICD-10 code, especially when the exact medical terminology is unclear. Whether you're looking for lay terms, similar diagnosis names, or common language alternatives, this list can help guide you to the correct ICD-10 classification.
- Functional disorder of polymorphonuclear neutrophil
- Heritable disorder of neutrophil function
New 2026 ICD-10-CM Code
D71.9 is new to ICD-10-CM code set for the FY 2026, effective October 1, 2025. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2025. This is a new and revised code for the FY 2026 (October 1, 2025 - September 30, 2026).
Index to Diseases and Injuries References
The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).
- Disorder (of) - See Also: Disease;
- functional polymorphonuclear neutrophils - D71.9
- neutrophil, polymorphonuclear - D71.9
- polymorphonuclear neutrophils - D71.9
Index of External Cause of Injuries
References found for this diagnosis code in the External Cause of Injuries Index:
- Disorder(of)
- functional polymorphonuclear neutrophils
- Disorder(of)
- neutrophil, polymorphonuclear
- Disorder(of)
- polymorphonuclear neutrophils
Replacement Code
D719 replaces the following previously assigned ICD-10-CM code(s):
- D71 - Functional disorders of polymorphonuclear neutrophils
Code History
- FY 2026 - Code Added, effective from 10/1/2025 through 9/30/2026
