2026 ICD-10-CM Diagnosis Code M27.51Perforation of root canal space due to endodontic treatment

ICD-10-CM Codes›M00–M99›M26-M27›M27

ICD-10-CM M27.51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M27.51 is a billable ICD-10-CM diagnosis code for perforation of root canal space due to endodontic treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 157 through 159. Coders also document this condition as perforation of root canal wall due to endodontic procedure. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; Caries, periodontitis, and other preventable dental conditions; and Disorders of jaw.

Code Identity

ICD-10-CM Code
M27.51
Billable Status
Yes — Valid for Submission
Code Describes
Perforation of root canal space due to endodontic treatment
Short Description
Perforation of root canal space due to endodontic treatment
Same as the full description in the CMS dataset.
Parent Code
M27.5
Periradicular pathology associated with previous endodontic treatment

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM26-M27Dentofacial anomalies [including malocclusion] and other disorders of jaw
CategoryM27Other diseases of jaws
This CodeM27.51Perforation of root canal space due to endodontic treatment

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Perforation of root canal wall due to endodontic procedure

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.

    • Perforation, perforated(nontraumatic) (of)
      • root canal space due to endodontic treatment

Clinical ClassificationClinical

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

CCSR DEN001
Any dental condition including traumatic injury
Default principal diagnosis: inpatient No · outpatient No
CCSR DEN003
Caries, periodontitis, and other preventable dental conditions
Default principal diagnosis: inpatient No · outpatient No
CCSR MUS029
Disorders of jaw
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DIG002
Disorders of teeth and gingiva
Default principal diagnosis: inpatient No · outpatient No
CCSR DEN002
Nontraumatic dental conditions
Default principal diagnosis: inpatient No · outpatient No

Convert M27.51 to ICD-9-CMHistory

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

ICD-9-CM
526.61 Perfor root canal space
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 M27.51Overview

Is M27.51 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report perforation of root canal space due to endodontic treatment on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M27.51 group to?

When perforation of root canal space due to endodontic treatment is the principal diagnosis on an inpatient stay, it groups to MS-DRG 157, 158, 159, with relative weights from 0.7085 to 1.7168 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M27.51?

Under the General Equivalence Mappings, perforation of root canal space due to endodontic treatment converts to ICD-9-CM 526.61 (perfor root canal space). 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.