R75 Inconclusive laboratory evidence of human immunodeficiency virus [HIV]

The ICD-10-CM code for Inconclusive laboratory evidence of human immunodeficiency virus [HIV] is R75 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)

Section

R70-R79: Abnormal findings on examination of blood, without diagnosis (R70-R79)

Category R75

1 code (1 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to R75:

• HIV › nonconclusive test (in infants)
• HIV › laboratory evidence (nonconclusive)
• Positive › test, human immunodeficiency virus (HIV)
• Test, tests, testing (for) › HIV (human immunodeficiency virus) › nonconclusive (in infants)
• Human › immunodeficiency virus (HIV) disease (infection) › laboratory evidence

Inclusion Terms

• Nonconclusive HIV-test finding in infants

U.S. Hospital Utilization

• An estimated 265 U.S. inpatient stays in 2023 included R75 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Inconclusive HIV serology (R75)

(f) Inconclusive HIV serology Patients with documentation of inconclusive HIV serology, may be assigned code R75, Inconclusive laboratory evidence of human immunodeficiency virus [HIV].

Previously diagnosed HIV-related illness (assign B20)

(g) Previously diagnosed HIV-related illness Patients with documentation of a prior diagnosis of an HIV-related illness should be coded to B20. Once an HIV-related illness has developed, code B20 should always be assigned on every subsequent admission/encounter. Patients previously diagnosed with any HIV illness (B20) should never be assigned to R75, Inconclusive laboratory evidence of human immunodeficiency virus [HIV] or Z21, Asymptomatic human immunodeficiency virus [HIV] infection status.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference R75 with the canonical source and edition:

R75 — Inconclusive laboratory evidence of human immunodeficiency virus [HIV]. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/R75

Canonical URL: https://icd10codingpro.com/codes/R75