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ICD-10-CM 2027 diagnosis code

J34.839Odontogenic sinusitis, unspecified

✓ Billable / specificNew for 2027

J34.839 is a valid, billable ICD-10-CM code for odontogenic sinusitis, unspecified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2027 (effective October 1, 2026). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About J34.839

J34.839 is the ICD-10-CM diagnosis code for odontogenic sinusitis, unspecified. It belongs to category J34 (other and unspecified disorders of nose and nasal sinuses), block J30-J39 (other diseases of upper respiratory tract) and chapter 10 (diseases of the respiratory 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 J34.83, choose J34.839 (unspecified) only when documentation doesn't support a more specific option: maxillary sinus (J34.830), ethmoid sinus (J34.831), frontal sinus (J34.832) and sphenoid sinus (J34.833).

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 154 (Other Ear, Nose, Mouth and Throat Diagnoses with MCC, relative weight 1.5921), DRG 155 (Other Ear, Nose, Mouth and Throat Diagnoses with CC, relative weight 0.9322), DRG 156 (Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCC, relative weight 0.6659) and DRG 795 (Normal Newborn, relative weight 0.2022), in MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), 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 was added in FY2027, effective October 1, 2026.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Odontogenic sinusitis NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to J34.839.

› From J34 Other and unspecified disorders of nose and nasal sinuses
Excludes2
  • varicose ulcer of nasal septum (I86.8)

Broader instructions also apply from Chapter 10: Diseases of the respiratory system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to J34.839.

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.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

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
  • FY2027 (effective 10/1/2026): Added

Common questions about J34.839

Is J34.839 billable?

Yes. J34.839 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can J34.839 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict J34.839 as a principal diagnosis.

Is J34.839 a CC or MCC?

No. J34.839 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does J34.839 group to?

J34.839 is used in the MS-DRG v44.0 logic for MS-DRG 154 (Other Ear, Nose, Mouth and Throat Diagnoses with MCC), MS-DRG 155 (Other Ear, Nose, Mouth and Throat Diagnoses with CC), MS-DRG 156 (Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCC) and MS-DRG 795 (Normal Newborn). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

Did J34.839 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was added to the code set.