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ICD-10-CM 2027 diagnosis code

H04.331Acute lacrimal canaliculitis of right lacrimal passage

✓ Billable / specific

H04.331 is a valid, billable ICD-10-CM code for acute lacrimal canaliculitis of right lacrimal passage. 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 H04.331

H04.331 is the ICD-10-CM diagnosis code for acute lacrimal canaliculitis of right lacrimal passage. It belongs to category H04 (disorders of lacrimal system), block H00-H05 (disorders of eyelid, lacrimal system and orbit) and chapter 7 (diseases of the eye and adnexa). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within H04.33 (acute lacrimal canaliculitis), H04.331 is specifically for acute lacrimal canaliculitis of right lacrimal passage. Related codes cover of left lacrimal passage (H04.332), of bilateral lacrimal passages (H04.333) and of unspecified lacrimal passage (H04.339).

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 121 (Acute Major Eye Infections with CC/MCC, relative weight 1.2255) and DRG 122 (Acute Major Eye Infections without CC/MCC, relative weight 0.7406), in MDC 02 (Diseases and Disorders of the Eye), 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 375.31 (acute canaliculitis, lacrimal).

Notes that apply from higher levels

Instructions written at a parent level also apply to H04.331.

› From H04.3 Acute and unspecified inflammation of lacrimal passages
Excludes1
  • neonatal dacryocystitis (P39.1)
› From H04 Disorders of lacrimal system
Excludes1
  • congenital malformations of lacrimal system (Q10.4-Q10.6)

Broader instructions also apply from H00-H05 Disorders of eyelid, lacrimal system and orbit and Chapter 7: Diseases of the eye and adnexa.

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 →
  • 375.31Acute canaliculitis, lacrimalapproximate

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 H04.331

Is H04.331 billable?

Yes. H04.331 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H04.331 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H04.331 as a principal diagnosis.

Is H04.331 a CC or MCC?

No. H04.331 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H04.331 group to?

H04.331 is used in the MS-DRG v44.0 logic for MS-DRG 121 (Acute Major Eye Infections with CC/MCC) and MS-DRG 122 (Acute Major Eye Infections 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 H04.331?

The CMS General Equivalence Mappings map H04.331 to ICD-9-CM 375.31.