2026 ICD-10-CM Diagnosis Code H04.551Acquired stenosis of right nasolacrimal duct

ICD-10-CM Codes›H00–H59›H00-H05›H04

ICD-10-CM H04.551
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H04.551 is a billable ICD-10-CM diagnosis code for acquired stenosis of right nasolacrimal duct. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. Coders also document this condition as acquired stenosis of nasolacrimal duct. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H04.551
Billable Status
Yes — Valid for Submission
Code Describes
Acquired stenosis of right nasolacrimal duct
Short Description
Acquired stenosis of right nasolacrimal duct
Same as the full description in the CMS dataset.
Parent Code
H04.55
Acquired stenosis of nasolacrimal duct

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH04Disorders of lacrimal system
This CodeH04.551Acquired stenosis of right nasolacrimal duct

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired stenosis of nasolacrimal duct
  • Acquired stenosis of right nasolacrimal duct
  • Stenosis of nasolacrimal duct
  • Stenosis of right nasolacrimal duct

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE008
Oculofacial plastics and orbital conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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Convert H04.551 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
375.56 Acq nasolacrml stenosis
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H04.551Overview

Is H04.551 (Acquired stenosis of nasolacrimal duct) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acquired stenosis of right nasolacrimal duct on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H04.551 group to?

When acquired stenosis of right nasolacrimal duct is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H04.551?

Under the General Equivalence Mappings, acquired stenosis of right nasolacrimal duct converts to ICD-9-CM 375.56 (acq nasolacrml stenosis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.