2026 ICD-10-CM Diagnosis Code M27.59Other periradicular pathology associated with previous endodontic treatment

ICD-10-CM Codes›M00–M99›M26-M27›M27

ICD-10-CM M27.59
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M27.59 is a billable ICD-10-CM diagnosis code for other periradicular pathology associated with previous 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 fracture of crown and root of immature permanent tooth following root canal treatment. 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
M27.59
Billable Status
Yes — Valid for Submission
Code Describes
Other periradicular pathology associated with previous endodontic treatment
Short Description
Oth periradicular pathology assoc w prev endodontic trtmt
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 CodeM27.59Other periradicular pathology associated with previous endodontic treatment

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fracture of crown and root of immature permanent tooth following root canal treatment
  • Fracture of crown and root of tooth
  • Fracture of crown of immature permanent tooth following root canal treatment
  • Fracture of root of immature permanent tooth following root canal treatment
  • Metal foreign body in mouth
  • Separated endodontic instrument in root canal of tooth

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.

    • Complication(s) (from) (of)
      • endodontic treatment NEC
    • Pathology(of)
      • periradicular, associated with previous endodontic treatment NEC

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 M27.59 to ICD-9-CMHistory

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

ICD-9-CM
526.69 Periradicular path NEC
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 M27.59Overview

Is M27.59 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other periradicular pathology associated with previous endodontic treatment on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M27.59 group to?

When other periradicular pathology associated with previous 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 M27.59?

Under the General Equivalence Mappings, other periradicular pathology associated with previous endodontic treatment converts to ICD-9-CM 526.69 (periradicular path NEC). 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.