2027 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. 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 the other POA exempt codes in Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).
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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Z86.2: its own notes plus those printed at Z86, block Z77-Z99, and Chapter 21. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
Code First
The underlying condition named in the note is sequenced before this code.
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
Notes
General instructions on how these codes are used.
- Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
- (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
- (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Z86.2, its category, or a range that includes it.
Use Additional Code 1
These codes say to use an additional code from the note, and Z86.2 is one of the codes named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
personal (of) See Also: History, family (of);
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, 2026 through September 30, 2027.
What MS-DRG does Z86.2 group to?
On inpatient claims, personal history of diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.
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. The code appears in the Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99) range of the CMS exempt list.
