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ICD-10-CM 2027 diagnosis code

S09.313APrimary blast injury of ear, bilateral, initial encounter

✓ Billable / specificRequires 7th characterCC — complication/comorbidity

S09.313A is a valid, billable ICD-10-CM code for primary blast injury of ear, bilateral, initial encounter. 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 S09.313A

S09.313A is the ICD-10-CM diagnosis code for primary blast injury of ear, bilateral, initial encounter. It belongs to category S09 (other and unspecified injuries of head), block S00-S09 (injuries to the head) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

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), DRG 963 (Other Multiple Significant Trauma with MCC, relative weight 2.6363), DRG 964 (Other Multiple Significant Trauma with CC, relative weight 1.4972) and DRG 965 (Other Multiple Significant Trauma without CC/MCC, relative weight 1.0059), in MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat) and MDC 24 (Multiple Significant Trauma), 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 872.62 (open wound of ossicles, without mention of complication), 872.63 (open wound of eustachian tube, without mention of complication), 872.64 (open wound of cochlea, without mention of complication) and 3 more.

7th character

Ainitial encounter

CC/MCC status for this injury by encounter: CC for A; Neither CC nor MCC for D, S.

Other encounter types for S09.313:

Notes that apply from higher levels

Instructions written at a parent level also apply to S09.313A.

› From S09.3 Other specified and unspecified injury of middle and inner ear
Excludes1
Excludes2

Broader instructions also apply from S00-S09 Injuries to the head and Chapter 19: Injury, poisoning and certain other consequences of external causes.

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 →
  • 872.62Open wound of ossicles, without mention of complicationapproximate
  • 872.63Open wound of eustachian tube, without mention of complicationapproximate
  • 872.64Open wound of cochlea, without mention of complicationapproximate
  • 872.72Open wound of ossicles, complicatedapproximate
  • 872.73Open wound of eustachian tube, complicatedapproximate
  • 872.74Open wound of cochlea, complicatedapproximate

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 S09.313A

Is S09.313A billable?

Yes. S09.313A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "A" at the end of S09.313A mean?

It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.

Can S09.313A be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict S09.313A as a principal diagnosis.

Is S09.313A a CC or MCC?

S09.313A is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does S09.313A group to?

S09.313A 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), MS-DRG 963 (Other Multiple Significant Trauma with MCC), MS-DRG 964 (Other Multiple Significant Trauma with CC) and MS-DRG 965 (Other Multiple Significant Trauma 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 S09.313A?

The CMS General Equivalence Mappings map S09.313A to ICD-9-CM 872.62, 872.63, 872.64, 872.72 and 2 more.