H21.55 – Recession of chamber angle

ICD-10-CM 2027 diagnosis code · Disorders of sclera, cornea, iris and ciliary body

Non-billable header

ICD-10-CM code H21.55

Code: H21.55 (claims format: H2155)
Description: Recession of chamber angle
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 7. Diseases of the eye and adnexa (H00-H59)
Block: H15-H22 Disorders of sclera, cornea, iris and ciliary body
Parent codes: H21 › H21.5

Billable codes under H21.55

H21.55 is a header code and cannot be used on claims. Choose the most specific code:

H21.551 – Recession of chamber angle, right eyeBillable
H21.552 – Recession of chamber angle, left eyeBillable
H21.553 – Recession of chamber angle, bilateralBillable
H21.559 – Recession of chamber angle, unspecified eyeBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

H21 – Other disorders of iris and ciliary body

Excludes2 (not included here):

sympathetic uveitis (H44.1-)

H21.5 – Other and unspecified adhesions and disruptions of iris and ciliary body

Excludes1 (not coded here):

corectopia (Q13.2)

Index terms for H21.55

Entries in the ICD-10-CM alphabetic index that lead to this code:

Recession, receding, chamber angle

Related codes in H21.5

H21.50 – Unspecified adhesions of irisHeader
H21.51 – Anterior synechiae (iris)Header
H21.52 – GoniosynechiaeHeader
H21.53 – IridodialysisHeader
H21.54 – Posterior synechiae (iris)Header
H21.56 – Pupillary abnormalitiesHeader

Frequently asked questions

What is ICD-10 code H21.55?

H21.55 is the ICD-10-CM code for recession of chamber angle, in the block H15-H22 (Disorders of sclera, cornea, iris and ciliary body).

Is H21.55 a billable code?

No. H21.55 is a header code with more specific child codes; report one of the billable codes listed above.

What category does H21.55 belong to?

It belongs to category H21 – Other disorders of iris and ciliary body.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.