2026 ICD-10-CM Diagnosis Code Z86.2Personal history of diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
Z86.2 is a billable ICD-10-CM diagnosis code for personal history of diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism. 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 Personal history of other disease.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z86.2.
Present on Admission (POA)Billing
Z86.2 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.
- H/O: anemia - iron deficient
- H/O: blood disorder
- H/O: coagulation defect
- H/O: hypertension
- H/O: purpura
- History of anemia
- History of anemia vitamin B12 deficient
- History of aplastic anemia
- History of autoimmune hemolytic anemia
- History of Diamond-Blackfan anemia
- History of Fanconi anemia
- History of hemolytic anemia
- History of hemolytic disease
- History of histiocytosis
- History of hypercoagulable state
- History of immune disorder
- History of immune thrombocytopenia
- History of immunodeficiency disorder
- History of lymphadenopathy
- History of lymphocytosis
- History of neutropenic disorder
- History of patient immunocompromised
- History of sickle cell anemia
- History of splenomegaly
- History of thrombocytopenia
- History of thrombophilia
- History of thrombosis with thrombocytopenia syndrome following vaccination
- History of thrombosis with thrombocytopenia syndrome following vaccination with non-replicating adenovirus vector vaccine for severe acute respiratory syndrome coronavirus 2
- Neutrophil production finding
- Neutrophil recovery
- Past pregnancy history of benign gestational thrombocytopenia
- Past pregnancy history of gestational hypertension
- Past pregnancy history of hemolysis-elevated liver enzymes-low platelet count syndrome
- Past pregnancy history of pre-eclampsia
- Past pregnancy history of severe pre-eclampsia
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
- personal (of) - See Also: History, family (of);
- disease or disorder (of) - Z87.898
- blood and blood-forming organs - Z86.2
- hematological - Z86.2
- immune mechanism - Z86.2
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- History
- personal (of)
- disease or disorder (of)
- blood and blood-forming organs
- History
- personal (of)
- disease or disorder (of)
- hematological
- History
- personal (of)
- disease or disorder (of)
- immune mechanism
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Blood Disorders
Your blood is living tissue made up of liquid and solids. The liquid part, called plasma, is made of water, salts and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells and platelets.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Z86.2 to ICD-9-CMHistory
Code HistoryHistory
Questions About Z86.2Overview
Is Z86.2 (Personal history of certain other diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report personal history of diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Can Z86.2 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because personal history of diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z86.2 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 personal history of diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism on inpatient claims.
What is the ICD-9 equivalent of Z86.2?
Under the General Equivalence Mappings, personal history of diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism converts to ICD-9-CM V12.29 (hx-endocr/meta/immun dis) and V12.3 (hx-blood diseases). The mapping is approximate, so confirm the match fits the documentation.
