What is ICD-10 code H40.89?

H40.89 is the ICD-10-CM diagnosis code for Other specified glaucoma. Glaucoma that does not fit into other specific categories, such as unusual types or combinations of glaucoma conditions. It belongs to the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59). H40.89 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. H40.89 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. H40.89 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. H40.89 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for H40.89?

H40.89 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards H40.89 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

What should coders know when reporting H40.89?

Use this code when the glaucoma type is documented but does not match other specific H40 codes Include documentation of the specific glaucoma type in the medical record for clarity

H40.89: Other specified glaucoma — ICD-10

ICD-10-CM Code View

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Code lookupH40.89Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the eye and adnexa (H00-H59) / Glaucoma (H40-H42)

H40.89

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Other specified glaucoma

Glaucoma that does not fit into other specific categories, such as unusual types or combinations of glaucoma conditions.

Buddy Insight

Other specified glaucoma captures glaucoma types that do not fit into the more specific subcategories, such as traumatic glaucoma, glaucoma associated with eye anomalies, or other rare forms.

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Not risk-adjusted for this model/period.

RAF 0

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Not risk-adjusted for this model/period.

RAF 0

RXHCC

Mapped

HCC 244

Glaucoma, Other

RAF 0.0

Code Trumping

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Code Book Path

Official

H40Glaucoma

H40.8Other glaucoma

H40.89Other specified glaucoma

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for H40.89 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for H40.89 in this effective period.

Related Child Codes

Official

H40.81Glaucoma with increased episcleral venous pressure

H40.82Hypersecretion glaucoma

H40.83Aqueous misdirection

H40.84Neovascular secondary angle closure glaucoma

Includes

Official

ICD-10-CM does not list Includes notes for H40.89 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for H40.89 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for H40.89 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for H40.89 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for H40.89 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Specific type of glaucoma documented (e.g., traumatic, developmental, associated with specific eye anomaly)

Laterality documented when applicable (note: H40.89 does not have laterality extension)

Intraocular pressure measurement

Optic nerve evaluation and cup-to-disc ratio

MEAT Support

HCC Buddy guidance

Specific type of glaucoma documented (e.g., traumatic, developmental, associated with specific eye anomaly)

Laterality documented when applicable (note: H40.89 does not have laterality extension)

Intraocular pressure measurement

Optic nerve evaluation and cup-to-disc ratio

Audit Caution

HCC Buddy guidance

Using H40.89 when a more specific glaucoma code exists — always check for a more precise classification first

Defaulting to this code without documenting the specific glaucoma type in the medical record

Confusing 'other specified' with 'unspecified' — H40.89 means the type is known but has no specific code; H40.9 means the type is unknown

Not coding the underlying etiology when the glaucoma is secondary to another condition

Common Mistakes

HCC Buddy guidance

H40.9 — Unspecified glaucoma (use H40.89 when the type IS specified but does not have its own code)

H40.10-H40.14 — Primary open-angle glaucoma (use when open-angle type is confirmed)

H40.20x — Primary angle-closure glaucoma subtypes (use when angle closure is confirmed)

H42 — Glaucoma in diseases classified elsewhere (use when glaucoma is due to a classified systemic disease)

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is H40.89 an HCC code?

No. H40.89 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.

HCC Category Mapping

RxHCCHCC 244, Glaucoma, Other

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work H40.89 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for H40.89

For H40.89to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed H40.89 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

H40.89 is the ICD-10-CM diagnosis code for other specified glaucoma. Glaucoma that does not fit into other specific categories, such as unusual types or combinations of glaucoma conditions. H40.89 sits in the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59), within the section covering glaucoma (h40-h42).

H40.89 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This code does not map to a CMS-HCC V28 payment category. Capture depends on documentation that supports the diagnosis; verify the HCC assignment against the current CMS mapping for the applicable payment year. Coders reviewing H40.89 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for H40.89 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code when the glaucoma type is documented but does not match other specific H40 codes
•Include documentation of the specific glaucoma type in the medical record for clarity

Clinical Significance

Other specified glaucoma captures glaucoma types that do not fit into the more specific subcategories, such as traumatic glaucoma, glaucoma associated with eye anomalies, or other rare forms. This code serves as a catch-all for documented glaucoma types that have a specific clinical diagnosis but lack a dedicated ICD-10-CM code. Proper documentation of the specific type is essential.

Documentation Requirements

✓Specific type of glaucoma documented (e.g., traumatic, developmental, associated with specific eye anomaly)
✓Laterality documented when applicable (note: H40.89 does not have laterality extension)
✓Intraocular pressure measurement
✓Optic nerve evaluation and cup-to-disc ratio
✓Visual field testing results
✓Etiology or underlying cause documented
✓Current treatment plan

Commonly Confused Codes

•H40.9: Unspecified glaucoma (use H40.89 when the type IS specified but does not have its own code)
•H40.10-H40.14: Primary open-angle glaucoma (use when open-angle type is confirmed)
•H40.20x: Primary angle-closure glaucoma subtypes (use when angle closure is confirmed)
•H42: Glaucoma in diseases classified elsewhere (use when glaucoma is due to a classified systemic disease)
•H40.40-H40.43: Glaucoma secondary to eye inflammation (use when uveitic glaucoma is the cause)