2026 ICD-10-CM Diagnosis Code H04.012Acute dacryoadenitis, left lacrimal gland

ICD-10-CM Codes›H00–H59›H00-H05›H04

ICD-10-CM H04.012
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H04.012 is a billable ICD-10-CM diagnosis code for acute dacryoadenitis, left lacrimal gland. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 121 through 122. Coders also document this condition as acute dacryoadenitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H04.012
Billable Status
Yes — Valid for Submission
Code Describes
Acute dacryoadenitis, left lacrimal gland
Short Description
Acute dacryoadenitis, left lacrimal gland
Same as the full description in the CMS dataset.
Parent Code
H04.01
Acute dacryoadenitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH04Disorders of lacrimal system
This CodeH04.012Acute dacryoadenitis, left lacrimal gland

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute dacryoadenitis
  • Acute dacryoadenitis of left eye
  • Dacryoadenitis of left eye

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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Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H04.012 to ICD-9-CMHistory

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

ICD-9-CM
375.01 Acute dacryoadenitis
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 H04.012Overview

Is H04.012 (Acute dacryoadenitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute dacryoadenitis, left lacrimal gland on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H04.012 group to?

When acute dacryoadenitis, left lacrimal gland is the principal diagnosis on an inpatient stay, it groups to MS-DRG 121, 122, with relative weights from 0.7858 to 1.1633 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H04.012?

Under the General Equivalence Mappings, acute dacryoadenitis, left lacrimal gland converts to ICD-9-CM 375.01 (acute dacryoadenitis). 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.