2026 ICD-10-CM Diagnosis Code R87.610Atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US)

ICD-10-CM Codes›R00–R99›R83-R89›R87

ICD-10-CM R87.610
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R87.610 is a billable ICD-10-CM diagnosis code for atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 742 through 743, 760 through 761. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as abnormal cervical Papanicolaou smear. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.

This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such abnormal female genital cytology.

Code Identity

ICD-10-CM Code
R87.610
Billable Status
Yes — Valid for Submission
Code Describes
Atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US)
Short Description
Atyp squam cell of undet signfc cyto smr crvx (ASC-US)
Parent Code
R87.61
Abnormal cytological findings in specimens from cervix uteri

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR83-R89Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis
CategoryR87Abnormal findings in specimens from female genital organs
This CodeR87.610Atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US)

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal cervical Papanicolaou smear
  • Atypical squamous cells of undetermined significance on cervical Papanicolaou smear

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.

    • Abnormal, abnormality, abnormalities
      • Papanicolaou (smear)
        • cervix
          • atypical squamous cells of undetermined significance (ASC-US)
    • ASC-US(atypical squamous cells of undetermined significance on cytologic smear)
      • cervix

Clinical ClassificationClinical

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

CCSR SYM017
Abnormal findings without diagnosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Cervical Cancer Screening

Cervical cancer is cancer that starts in the cells of the cervix. The cervix is part of the female reproductive system. It is the lower, narrow end of the uterus (womb), which opens into the vagina (birth canal). Cervical cancer screening is an important part of routine health care for people who have a cervix.

The full article covers:

  • What is cervical cancer screening?
  • What tests screen for cervical cancer?
  • What are the possible benefits and harms of cervical cancer screening?
  • Should I be screened for cervical cancer?

Read the full article at MedlinePlus

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

Convert R87.610 to ICD-9-CMHistory

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

ICD-9-CM
795.01 Pap smear (ASC-US)
Exact Match The mapping is direct, with no qualifiers.

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 R87.610Overview

Is R87.610 (Abnormal cytological findings in specimens from cervix uteri) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R87.610 group to?

When atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US) is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 743, 760, 761, with relative weights from 0.5696 to 1.8348 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R87.610 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US) is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R87.610?

Under the General Equivalence Mappings, atypical squamous cells of undetermined significance on cytologic smear of cervix (ASC-US) converts to ICD-9-CM 795.01 (pap smear (ASC-US)). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.