2026 ICD-10-CM Diagnosis Code Z13.0Encounter for screening for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism

ICD-10-CM Codes›Z00–Z99›Z00-Z13›Z13

ICD-10-CM Z13.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z13.0 is a billable ICD-10-CM diagnosis code for encounter for screening for 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 Encounter for observation and examination for conditions ruled out (excludes infectious disease, neoplasm, mental disorders).

Code Identity

ICD-10-CM Code
Z13.0
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for screening for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
Short Description
Encntr screen for dis of the bld/bld-form org/immun mechnsm
Parent Code
Z13
Encounter for screening for other diseases and disorders

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ00-Z13Persons encountering health services for examinations
CategoryZ13Encounter for screening for other diseases and disorders
This CodeZ13.0Encounter for screening for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z13.0.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z13.0 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.

  • Antibody to extractable nuclear antigen not detected
  • Anti-neutrophil cytoplasmic antibody not detected
  • Anti-nuclear factor not detected
  • Ascorbate-cyanide not detected by screening
  • Autoantibody titer not detected
  • Jo-1 antibody not detected
  • La antibody not detected
  • Mitochondrial antibodies not detected
  • Parietal cell antibodies not detected
  • Ribonucleoprotein antibody not detected
  • Ro antibody not detected
  • Scl 70 antibody not detected
  • Sm antibody not detected
  • Smooth muscle antibodies not detected

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Screening(for)
      • anemia
    • Screening(for)
      • disease or disorder
        • blood or blood-forming organ
    • Screening(for)
      • disease or disorder
        • immunity
    • Screening(for)
      • disease or disorder
        • sickle-cell (trait)
    • Screening(for)
      • hemoglobinopathies NEC
    • Screening(for)
      • immunity disorders
    • Screening(for)
      • sickle-cell disease or trait

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC003
Encounter for observation and examination for conditions ruled out (excludes infectious disease, neoplasm, mental disorders)
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Health Screening

Screenings are tests that look for diseases before you have symptoms. Screening tests can find diseases early, when they're easier to treat. You can get some screenings in your doctor's office. Others need special equipment, so you may need to go to a different office or clinic.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z13.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V78.2 Screen-sickle cell dis
Approximate The match is approximate rather than exact.
ICD-9-CM
V78.3 Scrn-hemoglobinopath NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
V78.9 Screen-blood dis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z13.0Overview

Is Z13.0 (Encounter for screening for other diseases and disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for screening for 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 Z13.0 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because encounter for screening for 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 Z13.0 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 encounter for screening for 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 Z13.0?

Under the General Equivalence Mappings, encounter for screening for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism converts to ICD-9-CM V78.2 (screen-sickle cell dis), V78.3 (scrn-hemoglobinopath NEC), and V78.9 (screen-blood dis NOS). The mapping is approximate, so confirm the match fits the documentation.