2027 ICD-10-CM Diagnosis Code Z67.31Type AB blood, Rh negative

ICD-10-CM Codes›Z00–Z99›Z67›Z67

ICD-10-CM Z67.31
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z67.31 is a billable ICD-10-CM diagnosis code for type AB blood, Rh negative. 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 Other specified status.

Code Identity

ICD-10-CM Code
Z67.31
Billable Status
Yes — Valid for Submission
Code Describes
Type AB blood, Rh negative
Short Description
Type AB blood, Rh negative
Same as the full description in the CMS dataset.
Parent Code
Z67.3
Type AB blood

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ67Blood type
CategoryZ67Blood type
This CodeZ67.31Type AB blood, Rh negative

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z67.31.

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

Z67.31 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Blood type (Z67).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z67.31: its own notes plus those printed at Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Notes

General instructions on how these codes are used.

From Chapter 21 (Z00-Z99) Factors influencing health status and contact with health services applies to 1,425 codes
  • 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.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR FAC025
Other specified status
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Blood

Your blood is 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 Z67.31 to ICD-9-CMHistory

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

ICD-9-CM
No Map There is no ICD-9 equivalent for this code.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Z67.31Overview

What is the ICD-10 code for type AB blood, Rh negative?

The ICD-10-CM code for type AB blood, Rh negative is Z67.31 (sometimes written as Z6731). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Z67.31 (Type AB blood) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report type AB blood, Rh negative on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Z67.31 group to?

On inpatient claims, type AB blood, Rh negative 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 Z67.31 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because type AB blood, Rh negative describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z67.31 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 type AB blood, Rh negative on inpatient claims. The code appears in the Blood type (Z67) range of the CMS exempt list.