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ICD-10-CM 2027 diagnosis code

H70.892Other mastoiditis and related conditions, left ear

✓ Billable / specific

H70.892 is a valid, billable ICD-10-CM code for other mastoiditis and related conditions, left ear. 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 H70.892

H70.892 is the ICD-10-CM diagnosis code for other mastoiditis and related conditions, left ear. It belongs to category H70 (mastoiditis and related conditions), block H65-H75 (diseases of middle ear and mastoid) and chapter 8 (diseases of the ear and mastoid process). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within H70.89 (other mastoiditis and related conditions), H70.892 is specifically for other mastoiditis and related conditions, left ear. Related codes cover right ear (H70.891), bilateral (H70.893) and unspecified ear (H70.899).

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) and DRG 156 (Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCC, relative weight 0.6659), in 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 383.89 (other disorders of mastoid).

Notes that apply from higher levels

Instructions written at a parent level also apply to H70.892.

› From H70.8 Other mastoiditis and related conditions
Excludes1
  • preauricular sinus and cyst (Q18.1)
  • sinus, fistula, and cyst of branchial cleft (Q18.0)

Broader instructions also apply from Chapter 8: Diseases of the ear and mastoid process.

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 →
  • 383.89Other disorders of mastoidapproximate

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 H70.892

Is H70.892 billable?

Yes. H70.892 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H70.892 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H70.892 as a principal diagnosis.

Is H70.892 a CC or MCC?

No. H70.892 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H70.892 group to?

H70.892 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) and MS-DRG 156 (Other Ear, Nose, Mouth and Throat Diagnoses 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 H70.892?

The CMS General Equivalence Mappings map H70.892 to ICD-9-CM 383.89.