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ICD-10-CM 2027 diagnosis code

J35.02Chronic adenoiditis

✓ Billable / specific

J35.02 is a valid, billable ICD-10-CM code for chronic adenoiditis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Adenoiditis.

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 J35.02

J35.02 is the ICD-10-CM diagnosis code for chronic adenoiditis. It belongs to category J35 (chronic diseases of tonsils and adenoids), 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 J35.0 (chronic tonsillitis and adenoiditis), J35.02 is specifically for chronic adenoiditis. Related codes cover tonsillitis (J35.01) and tonsillitis and adenoiditis (J35.03).

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 152 (Otitis Media and URI with MCC, relative weight 1.1151) and DRG 153 (Otitis Media and URI without MCC, relative weight 0.7421), 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 474.01 (chronic adenoiditis).

Notes that apply from higher levels

Instructions written at a parent level also apply to J35.02.

› From J35.0 Chronic tonsillitis and adenoiditis
Excludes2
  • acute tonsillitis (J03.-)

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

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to J35.02.

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 03 · Diseases and Disorders of the Ear, Nose, Mouth and Throat

ICD-9-CM equivalent

Converter →
  • 474.01Chronic adenoiditisexact

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 J35.02

Is J35.02 billable?

Yes. J35.02 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can J35.02 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict J35.02 as a principal diagnosis.

Is J35.02 a CC or MCC?

No. J35.02 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does J35.02 group to?

J35.02 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 152 (Otitis Media and URI with MCC) and MS-DRG 153 (Otitis Media and URI without 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 J35.02?

The CMS General Equivalence Mappings map J35.02 to ICD-9-CM 474.01.