2026 ICD-10-CM Diagnosis Code R85.618Other abnormal cytological findings on specimens from anus

ICD-10-CM Codes›R00–R99›R83-R89›R85

ICD-10-CM R85.618
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R85.618 is a billable ICD-10-CM diagnosis code for other abnormal cytological findings on specimens from anus. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. 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 anal Papanicolaou smear. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.

Code Identity

ICD-10-CM Code
R85.618
Billable Status
Yes — Valid for Submission
Code Describes
Other abnormal cytological findings on specimens from anus
Short Description
Other abnormal cytological findings on specimens from anus
Same as the full description in the CMS dataset.
Parent Code
R85.61
Abnormal cytologic smear of anus

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
CategoryR85Abnormal findings in specimens from digestive organs and abdominal cavity
This CodeR85.618Other abnormal cytological findings on specimens from anus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal anal Papanicolaou smear
  • Atypical glandular cells on anal 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
      • cytology
        • anus
          • specified NEC
    • Abnormal, abnormality, abnormalities
      • Papanicolaou (smear)
        • anus
          • specified NEC

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

Convert R85.618 to ICD-9-CMHistory

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

ICD-9-CM
796.79 Oth abn Pap smr anus/HPV
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 R85.618Overview

Is R85.618 (Abnormal cytologic smear of anus) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other abnormal cytological findings on specimens from anus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R85.618 group to?

When other abnormal cytological findings on specimens from anus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R85.618 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the other abnormal cytological findings on specimens from anus is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R85.618?

Under the General Equivalence Mappings, other abnormal cytological findings on specimens from anus converts to ICD-9-CM 796.79 (oth abn Pap smr anus/HPV). The mapping is approximate, so confirm the match fits the documentation.

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.