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ICD-10-CM H40.51X4: Glaucoma secondary to other eye disorders, right eye, indeterminate stage

H40.51X4 is the billable ICD-10-CM code for glaucoma secondary to other eye disorders, right eye, indeterminate stage, in category H40 (Glaucoma) of the Glaucoma section. As a principal diagnosis it groups to MS-DRG 124 Other Disorders of the Eye with MCC or Thrombolytic Agent, MS-DRG 125 Other Disorders of the Eye without MCC (MDC 02 MDC 02: Diseases and Disorders of the Eye). 23 LCD billing and coding articles list it as covered.

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
H40.51X4
billable FY2027 ICD-10-CM code
Category
H40 Glaucoma
Chapter
7: Diseases of the eye and adnexa (H00-H59)
CC/MCC (MS-DRG v44)
Neither
CMS-HCC V28
Not mapped
POA reporting
Required

Tabular list notes for H40.51X4

The tabular list has no notes on H40.51X4 itself; the notes below apply from its parent headings.

Inherited from H40 (Glaucoma)

Excludes1 (never coded together)
  • absolute glaucoma (H44.51-)
  • congenital glaucoma (Q15.0)
  • traumatic glaucoma due to birth injury (P15.3)

Inherited from H40.5 (Glaucoma secondary to other eye disorders)

Code also
  • underlying eye disorder

The 7th character 4 means “indeterminate stage”, as defined at H40.5. The same injury coded for a later encounter uses a different 7th character, so check each encounter.

MS-DRG grouping when H40.51X4 is the principal diagnosis

MS-DRG v44 groups for H40.51X4 as principal diagnosis
MDCMS-DRGs
02 MDC 02: Diseases and Disorders of the Eye124125

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for H40.51X4 shows the full grouping logic.

CC/MCC status and inpatient edits

H40.51X4 is neither a CC nor an MCC under MS-DRG v44, so as a secondary diagnosis it does not raise the MS-DRG severity level. Check H40.51X4 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.

CMS-HCC V28 risk adjustment

H40.51X4 does not map to a payment HCC in the PY2027 CMS-HCC V28 model, so on its own it does not change a Medicare Advantage risk score.

LCD billing and coding articles that list H40.51X4

23 current Medicare billing and coding articles list H40.51X4 among the diagnoses that support medical necessity for the services they cover.

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Frequently asked questions

What does ICD-10-CM H40.51X4 mean?

H40.51X4 means glaucoma secondary to other eye disorders, right eye, indeterminate stage. It is one of 25 billable codes under H40, glaucoma.

Which MS-DRG does H40.51X4 group to?

As the principal diagnosis, H40.51X4 groups to MS-DRG 124 Other Disorders of the Eye with MCC or Thrombolytic Agent, MS-DRG 125 Other Disorders of the Eye without MCC (MDC 02 MDC 02: Diseases and Disorders of the Eye) under MS-DRG v44, before procedures and secondary diagnoses are applied.

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

The descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.