2026 ICD-10-CM Diagnosis Code Z84.0Family history of diseases of the skin and subcutaneous tissue
Z84.0 is a billable ICD-10-CM diagnosis code for family history of diseases of the skin and subcutaneous tissue. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Family history of disease.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z84.0.
Present on Admission (POA)Billing
Z84.0 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Familial psoriasis
- Familial psoriasis with affected first degree relative
- Family history of acne
- Family history of localized scleroderma
- Family history of lupus erythematosus
- Family history of morphea
- Family history of psoriasis with psoriatic arthritis
- Family history of scleroderma
- FH: Alopecia
- FH: Arthritis
- FH: Eczema
- FH: Hirsutism
- FH: Psoriasis
- FH: Skin disease
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- History
- family (of) - See Also: History, personal (of);
- skin and subcutaneous tissue NEC - Z84.0
- skin condition - Z84.0
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- History
- family (of)
- disease or disorder (of)
- skin and subcutaneous tissue NEC
- History
- family (of)
- skin condition
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Family History
Your family history includes health information about you and your close relatives. Families have many factors in common, including their genes, environment, and lifestyle. Looking at these factors can help you figure out whether you have a higher risk for certain health problems, such as heart disease, stroke, and cancer.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Z84.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z84.0Overview
Is Z84.0 (Family history of other conditions) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report family history of diseases of the skin and subcutaneous tissue on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Can Z84.0 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because family history of diseases of the skin and subcutaneous tissue describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z84.0 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for family history of diseases of the skin and subcutaneous tissue on inpatient claims.
What is the ICD-9 equivalent of Z84.0?
Under the General Equivalence Mappings, family history of diseases of the skin and subcutaneous tissue converts to ICD-9-CM V19.4 (family hx-skin condition). The mapping is approximate, so confirm the match fits the documentation.
