2027 ICD-10-CM Diagnosis Code Z36.85Encounter for antenatal screening for Streptococcus B

ICD-10-CM Codes›Z00–Z99›Z30-Z39›Z36

ICD-10-CM Z36.85
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z36.85 is a billable ICD-10-CM diagnosis code for encounter for antenatal screening for Streptococcus B. 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 restricted by the Medicare Code Editor to maternity cases (age 9 through 64) and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Antenatal screening.

Code Identity

ICD-10-CM Code
Z36.85
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for antenatal screening for Streptococcus B
Short Description
Encounter for antenatal screening for Streptococcus B
Same as the full description in the CMS dataset.
Parent Code
Z36.8
Encounter for other antenatal screening

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ30-Z39Persons encountering health services in circumstances related to reproduction
CategoryZ36Encounter for antenatal screening of mother
This CodeZ36.85Encounter for antenatal screening for Streptococcus B

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z36.85.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Present on Admission (POA)Billing

Z36.85 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Persons encountering health services in circumstances related to reproduction (Z30-Z39).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z36.85: its own notes plus those printed at Z36 and Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Z36 Encounter for antenatal screening of mother applies to 17 codes
  • Encounter for placental sample (taken vaginally)
  • Screening is the testing for disease or disease precursors in asymptomatic individuals so that early detection and treatment can be provided for those who test positive for the disease.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Z36 Encounter for antenatal screening of mother applies to 17 codes
  • diagnostic examination- code to sign or symptom
  • encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
  • suspected fetal condition affecting management of pregnancy - code to condition in Chapter 15

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Z36 Encounter for antenatal screening of mother applies to 17 codes
  • abnormal findings on antenatal screening of mother (O28.-)
  • genetic counseling and testing (Z31.43-, Z31.5)
  • routine prenatal care (Z34)

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Z36.85, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming Z36.85: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block Z00-Z13 Persons encountering health services for examinations
    examinations related to pregnancy and reproduction (Z30-Z36, Z39.-) names Z30-Z36, which includes this code

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 PRG001
Antenatal screening
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Strep B Test

Strep B, also known as group B strep (GBS), is a type of bacteria commonly found in the digestive tract, urinary tract, and genital area. Many healthy people have GBS bacteria in their bodies.

Read the full article at MedlinePlus

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

Convert Z36.85 to ICD-9-CMHistory

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

ICD-9-CM
V28.6 Antenatal screen strep b
Exact Match The mapping is direct, with no qualifiers.

Code History & ChangesHistory

Replacement Z36.85 replaces the following previously assigned code(s):

  • Z36 - Encounter for antenatal screening of mother
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Z36.85Overview

What is the ICD-10 code for encounter for antenatal screening for Streptococcus B?

The ICD-10-CM code for encounter for antenatal screening for Streptococcus B is Z36.85 (sometimes written as Z3685). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Z36.85 (Encounter for other antenatal screening) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for antenatal screening for Streptococcus B on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Z36.85 group to?

When encounter for antenatal screening for Streptococcus B is the principal diagnosis on an inpatient stay, it groups to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.

Who can Z36.85 be reported for?

The Medicare Code Editor checks encounter for antenatal screening for Streptococcus B against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Is Z36.85 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 antenatal screening for Streptococcus B on inpatient claims. The code appears in the Persons encountering health services in circumstances related to reproduction (Z30-Z39) range of the CMS exempt list.