Question 1

What is ICD-10 code H44.321?

Accepted Answer

H44.321 is the ICD-10-CM diagnosis code for Siderosis of eye, right eye. It belongs to the ICD-10-CM chapter for diseases of the eye and adnexa (h00-h59). H44.321 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. H44.321 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.

Question 2

Is H44.321 an HCC code?

Accepted Answer

H44.321 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 3

Is H44.321 billable?

Accepted Answer

Yes. H44.321 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. H44.321 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.

Question 4

Which HCC does H44.321 map to under V28?

Accepted Answer

H44.321 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 5

What RAF reference is published for H44.321?

Accepted Answer

H44.321 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

Question 6

What is the V28 vs V24 difference for H44.321?

Accepted Answer

H44.321 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

Question 7

What documentation supports H44.321?

Accepted Answer

Verify laterality is documented in the medical record - this code is specific to the right eye; use H44.322 for left eye or H44.323 for bilateral involvement Look for documentation of the cause (foreign body, occupational exposure, trauma) as this may require an additional external cause code (W-Y codes) for proper documentation H44.321 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Question 8

Can H44.321 be a primary diagnosis?

Accepted Answer

Yes. H44.321 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Question 9

Which codes cannot be reported with H44.321?

Accepted Answer

No Excludes1 note applies to H44.321 or its category in the FY2026 tabular, so there is no code the classification forbids alongside it. The Excludes2 note lists certain conditions originating in the perinatal period (P04-P96); certain infectious and parasitic diseases (A00-B99); complications of pregnancy, childbirth and the puerperium (O00-O9A); congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99); and 7 more (see the notes on this page); those are separate conditions that may be reported together with H44.321 when both are documented.

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H44.321

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H44.321 ICD-10-CM Code: Siderosis of eye, right eye

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H44.321

Is H44.321 an HCC code?

Get the V28 mapping + MEAT cheat sheet

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Also searched as

Work H44.321 in HCC Buddy