H40.21
Non-billableAcute angle-closure glaucoma
Acute angle-closure glaucoma
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Acute angle-closure glaucoma attack
- Acute angle-closure glaucoma crisis
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •diabetes mellitus related eye conditions, , ,E09.3, E10.3, E11.3, E13.3
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury (trauma) of eye and orbitS05
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •syphilis related eye disorders, , ,A50.01, A50.3, A51.43, A52.71
Child Codes (4)
Related Codes(4)
Also Known As / Clinical Terms(11)
UMLS
- AACG - Acute angle closure glaucomaC0154946
- Acute angle closure glaucomaC0154946
- Acute angle-closure glaucomaC0154946
- Acute angle-closure glaucoma (disorder)C0154946
- Acute closed-angle glaucomaC0154946
- Angle closure glaucoma acuteC0154946
- acute angle closure glaucomaC0154946
- acute angle-closure glaucomaC0154946
- acute closed-angle glaucomaC0154946
- Acute angle-closure glaucoma attackC3161424
- Acute angle-closure glaucoma crisisC3161425
Frequently Asked Questions
What is the ICD-10 code for acute angle-closure glaucoma?
The ICD-10-CM code for acute angle-closure glaucoma is H40.21. The full clinical description is "Acute angle-closure glaucoma". H40.21 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code H40.21 mean?
ICD-10-CM code H40.21 represents “Acute angle-closure glaucoma”. It is classified under Chapter 7: Diseases of the Eye and Adnexa and is a non-billable header code. Use a more specific child code for billing purposes.
Is H40.21 a billable code?
No, H40.21 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 4 child codes under H40.21.
What chapter is H40.21 in?
H40.21 is in Chapter 7: Diseases of the Eye and Adnexa (codes H00-H59).
What codes cannot be used with H40.21?
H40.21 has Excludes1 notes indicating codes that cannot be used together with it, including: absolute glaucoma (H44.51-); congenital glaucoma (Q15.0); traumatic glaucoma due to birth injury (P15.3); and 2 more.
What are the subcategories under H40.21?
H40.21 has 4 child codes, including: H40.211 (Acute angle-closure glaucoma, right eye), H40.212 (Acute angle-closure glaucoma, left eye), H40.213 (Acute angle-closure glaucoma, bilateral), H40.219 (Acute angle-closure glaucoma, unspecified eye).
What are the UMLS CUIs for H40.21?
H40.21 is linked to 3 UMLS Concept Unique Identifiers: C0154946, C3161424, C3161425. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does H40.21 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like acute angle-closure glaucoma affect a person's functioning: body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of H40.21?
There is no direct ICD-11 mapping available for H40.21 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.