ICD-10-CM 2027
ICD-10 code for conjunctivitis NOS
From the official ICD-10-CM alphabetic index entry “Conjunctivitis (staphylococcal) (streptococcal) NOS”. Page updated September 29, 2026.
About coding conjunctivitis NOS
The ICD-10-CM code for conjunctivitis NOS is H10.9 (Unspecified conjunctivitis). The official index lists 80 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H10.9.
Within H10, choose H10.9 (Unspecified conjunctivitis) only when documentation doesn't support a more specific option: mucopurulent conjunctivitis (H10.0), acute atopic conjunctivitis (H10.1), other acute conjunctivitis (H10.2), unspecified acute conjunctivitis (H10.3), chronic conjunctivitis (H10.4), blepharoconjunctivitis (H10.5) and other conjunctivitis (H10.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent, relative weight 1.2471) and DRG 125 (Other Disorders of the Eye without MCC, relative weight 0.7702), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific conjunctivitis NOS codes (official index)
- Acanthamoeba B60.12 — Conjunctivitis due to Acanthamoeba
- acute H10.3 — Unspecified acute conjunctivitis
- atopic H10.1 — Acute atopic conjunctivitis
- mucopurulent H10.02 — Other mucopurulent conjunctivitis
- follicular H10.01 — Acute follicular conjunctivitis
- chemical H10.21 — Acute toxic conjunctivitis
- pseudomembranous H10.22 — Pseudomembranous conjunctivitis
- serous except viral H10.23 — Serous conjunctivitis, except viral
- viral
- toxic H10.21 — Acute toxic conjunctivitis
- adenoviral (acute) (follicular) B30.1 — Conjunctivitis due to adenovirus
- allergic (acute)
- chronic H10.45 — Other chronic allergic conjunctivitis
- vernal H10.44 — Vernal conjunctivitis
- anaphylactic
- Apollo B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- atopic (acute)
- Béal's B30.2 — Viral pharyngoconjunctivitis
- blennorrhagic (gonococcal) (neonatorum) A54.31 — Gonococcal conjunctivitis
- chemical (acute) H10.21 — Acute toxic conjunctivitis
- chlamydial A74.0 — Chlamydial conjunctivitis
- due to trachoma A71.1 — Active stage of trachoma
- neonatal P39.1 — Neonatal conjunctivitis and dacryocystitis
- chronic (nodosa) (petrificans) (phlyctenular) H10.40 — Unspecified chronic conjunctivitis
- allergic H10.45 — Other chronic allergic conjunctivitis
- vernal H10.44 — Vernal conjunctivitis
- follicular H10.43 — Chronic follicular conjunctivitis
- giant papillary H10.41 — Chronic giant papillary conjunctivitis
- simple H10.42 — Simple chronic conjunctivitis
- vernal H10.44 — Vernal conjunctivitis
- coxsackievirus 24 B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- diphtheritic A36.86 — Diphtheritic conjunctivitis
- due to
- dust
- filariasis B74.9 — Filariasis, unspecified
- mucocutaneous leishmaniasis B55.2 — Mucocutaneous leishmaniasis
- enterovirus type 70 (hemorrhagic) B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- epidemic (viral) B30.9 — Viral conjunctivitis, unspecified
- hemorrhagic B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- gonococcal (neonatorum) A54.31 — Gonococcal conjunctivitis
- granular (trachomatous) A71.1 — Active stage of trachoma
- sequelae (late effect) B94.0 — Sequelae of trachoma
- hemorrhagic (acute) (epidemic) B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- herpes zoster B02.31 — Zoster conjunctivitis
- in (due to)
- Acanthamoeba B60.12 — Conjunctivitis due to Acanthamoeba
- adenovirus (acute) (follicular) B30.1 — Conjunctivitis due to adenovirus
- Chlamydia A74.0 — Chlamydial conjunctivitis
- coxsackievirus 24 B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- diphtheria A36.86 — Diphtheritic conjunctivitis
- enterovirus type 70 (hemorrhagic) B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- filariasis B74.9 — Filariasis, unspecified
- gonococci A54.31 — Gonococcal conjunctivitis
- herpes (simplex) virus B00.53 — Herpesviral conjunctivitis
- zoster B02.31 — Zoster conjunctivitis
- infectious disease NEC B99 — Other and unspecified infectious diseases
- meningococci A39.89 — Other meningococcal infections
- mucocutaneous leishmaniasis B55.2 — Mucocutaneous leishmaniasis
- rosacea H10.82 — Rosacea conjunctivitis
- syphilis (late) A52.71 — Late syphilitic oculopathy
- zoster B02.31 — Zoster conjunctivitis
- inclusion A74.0 — Chlamydial conjunctivitis
- infantile P39.1 — Neonatal conjunctivitis and dacryocystitis
- gonococcal A54.31 — Gonococcal conjunctivitis
- Koch-Weeks'
- light
- ligneous
- meningococcal A39.89 — Other meningococcal infections
- mucopurulent
- neonatal P39.1 — Neonatal conjunctivitis and dacryocystitis
- gonococcal A54.31 — Gonococcal conjunctivitis
- Newcastle B30.8 — Other viral conjunctivitis
- of Béal B30.2 — Viral pharyngoconjunctivitis
- parasitic
- filariasis B74.9 — Filariasis, unspecified
- mucocutaneous leishmaniasis B55.2 — Mucocutaneous leishmaniasis
- Parinaud's H10.89 — Other conjunctivitis
- petrificans H10.89 — Other conjunctivitis
- rosacea H10.82 — Rosacea conjunctivitis
- specified NEC H10.89 — Other conjunctivitis
- swimming-pool B30.1 — Conjunctivitis due to adenovirus
- trachomatous A71.1 — Active stage of trachoma
- acute A71.0 — Initial stage of trachoma
- sequelae (late effect) B94.0 — Sequelae of trachoma
- traumatic NEC H10.89 — Other conjunctivitis
- tuberculous A18.59 — Other tuberculosis of eye
- tularemic A21.1 — Oculoglandular tularemia
- tularensis A21.1 — Oculoglandular tularemia
- viral B30.9 — Viral conjunctivitis, unspecified
- due to
- adenovirus B30.1 — Conjunctivitis due to adenovirus
- enterovirus B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral)
- specified NEC B30.8 — Other viral conjunctivitis
Common questions about conjunctivitis NOS ICD-10 codes
What is the ICD-10 code for conjunctivitis NOS?
- H10.9 — Unspecified conjunctivitis. More specific codes apply when the documentation supports them: B60.12, H10.3, H10.1, H10.02 and others below.
What is the ICD-10 code for acanthamoeba conjunctivitis nos?
- B60.12 — Conjunctivitis due to Acanthamoeba.
What is the ICD-10 code for acute conjunctivitis nos?
- H10.3 — Unspecified acute conjunctivitis (header code; choose a more specific subcode).
What is the ICD-10 code for adenoviral conjunctivitis nos?
- B30.1 — Conjunctivitis due to adenovirus.
What is the ICD-10 code for apollo conjunctivitis nos?
- B30.3 — Acute epidemic hemorrhagic conjunctivitis (enteroviral).
What is the ICD-10 code for béal's conjunctivitis nos?
- B30.2 — Viral pharyngoconjunctivitis.
What is the ICD-10 code for blennorrhagic conjunctivitis nos?
- A54.31 — Gonococcal conjunctivitis.
Is H10.9 billable?
- Yes. H10.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H10.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H10.9 as a principal diagnosis.
Is H10.9 a CC or MCC?
- No. H10.9 is neither a CC nor an MCC under MS-DRG v44.0.