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ICD-10-CM 2027 diagnosis code

K08.51Open restoration margins of tooth

✓ Billable / specific

K08.51 is a valid, billable ICD-10-CM code for open restoration margins of tooth. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K08.51

K08.51 is the ICD-10-CM diagnosis code for open restoration margins of tooth. It belongs to category K08 (other disorders of teeth and supporting structures), block K00-K14 (diseases of oral cavity and salivary glands) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K08.5 (unsatisfactory restoration of tooth), K08.51 is specifically for open restoration margins of tooth. Related codes cover unspecified (K08.50), Unrepairable overhanging of dental restorative materials (K08.52), fractured dental restorative material (K08.53), Contour of existing restoration of tooth biologically incompatible with oral health (K08.54), allergy to existing dental restorative material (K08.55), poor aesthetic of existing restoration of tooth (K08.56) and other unsatisfactory restoration of tooth (K08.59).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC, relative weight 5.6154), DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC, relative weight 4.381), DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC, relative weight 2.7307), DRG 157 (Dental and Oral Diseases with MCC, relative weight 1.809), DRG 158 (Dental and Oral Diseases with CC, relative weight 0.9366) and DRG 159 (Dental and Oral Diseases without CC/MCC, relative weight 0.6893), in Pre-MDC and MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 525.61 (open restoration margins).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Dental restoration failure of marginal integrity
  • Open margin on tooth restoration
  • Poor gingival margin to tooth restoration

Notes that apply from higher levels

Instructions written at a parent level also apply to K08.51.

› From K08.5 Unsatisfactory restoration of tooth
Excludes1
  • dental restoration status (Z98.811)
Excludes2
  • endosseous dental implant failure (M27.6-)
  • unsatisfactory endodontic treatment (M27.5-)
› From K08 Other disorders of teeth and supporting structures
Excludes2
  • dentofacial anomalies [including malocclusion] (M26.-)
  • disorders of jaw (M27.-)

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

Alphabetic index entries

7 entries

Terms in the official ICD-10-CM index that lead to K08.51.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 525.61Open restoration marginsexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about K08.51

Is K08.51 billable?

Yes. K08.51 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K08.51 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K08.51 as a principal diagnosis.

Is K08.51 a CC or MCC?

No. K08.51 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does K08.51 group to?

K08.51 is used in the MS-DRG v44.0 logic for MS-DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC), MS-DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC), MS-DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC), MS-DRG 157 (Dental and Oral Diseases with MCC), MS-DRG 158 (Dental and Oral Diseases with CC) and MS-DRG 159 (Dental and Oral Diseases without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for K08.51?

The CMS General Equivalence Mappings map K08.51 to ICD-9-CM 525.61.