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ICD-10-CM 2027

ICD-10 code for conjunctivitis

H10.9

Unspecified conjunctivitis

✓ Billable / specific

Confirmed by the official ICD-10-CM index entry “conjunctivitis (staphylococcal) (streptococcal) nos”. Page updated September 29, 2026.

About coding conjunctivitis

The ICD-10-CM code for conjunctivitis is H10.9 (Unspecified conjunctivitis). The official index lists 71 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H10.9.

It is also searched as pink eye.

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.

Related Conjunctivitis codes

  • H10.011 Acute follicular conjunctivitis, right eye
  • H10.012 Acute follicular conjunctivitis, left eye
  • H10.013 Acute follicular conjunctivitis, bilateral
  • H10.019 Acute follicular conjunctivitis, unspecified eye
  • H10.021 Other mucopurulent conjunctivitis, right eye
  • H10.022 Other mucopurulent conjunctivitis, left eye
  • H10.023 Other mucopurulent conjunctivitis, bilateral
  • H10.029 Other mucopurulent conjunctivitis, unspecified eye
  • H10.10 Acute atopic conjunctivitis, unspecified eye
  • H10.11 Acute atopic conjunctivitis, right eye
  • H10.12 Acute atopic conjunctivitis, left eye
  • H10.13 Acute atopic conjunctivitis, bilateral
  • H10.211 Acute toxic conjunctivitis, right eye
  • H10.212 Acute toxic conjunctivitis, left eye
  • H10.213 Acute toxic conjunctivitis, bilateral
  • H10.219 Acute toxic conjunctivitis, unspecified eye
  • H10.221 Pseudomembranous conjunctivitis, right eye
  • H10.222 Pseudomembranous conjunctivitis, left eye
  • H10.223 Pseudomembranous conjunctivitis, bilateral
  • H10.229 Pseudomembranous conjunctivitis, unspecified eye
  • H10.231 Serous conjunctivitis, except viral, right eye
  • H10.232 Serous conjunctivitis, except viral, left eye
  • H10.233 Serous conjunctivitis, except viral, bilateral
  • H10.239 Serous conjunctivitis, except viral, unspecified eye
  • H10.30 Unspecified acute conjunctivitis, unspecified eye
  • H10.31 Unspecified acute conjunctivitis, right eye
  • H10.32 Unspecified acute conjunctivitis, left eye
  • H10.33 Unspecified acute conjunctivitis, bilateral
  • H10.401 Unspecified chronic conjunctivitis, right eye
  • H10.402 Unspecified chronic conjunctivitis, left eye
  • H10.403 Unspecified chronic conjunctivitis, bilateral
  • H10.409 Unspecified chronic conjunctivitis, unspecified eye
  • H10.411 Chronic giant papillary conjunctivitis, right eye
  • H10.412 Chronic giant papillary conjunctivitis, left eye
  • H10.413 Chronic giant papillary conjunctivitis, bilateral
  • H10.419 Chronic giant papillary conjunctivitis, unspecified eye
  • H10.421 Simple chronic conjunctivitis, right eye
  • H10.422 Simple chronic conjunctivitis, left eye
  • H10.423 Simple chronic conjunctivitis, bilateral
  • H10.429 Simple chronic conjunctivitis, unspecified eye
  • H10.431 Chronic follicular conjunctivitis, right eye
  • H10.432 Chronic follicular conjunctivitis, left eye
  • H10.433 Chronic follicular conjunctivitis, bilateral
  • H10.439 Chronic follicular conjunctivitis, unspecified eye
  • H10.44 Vernal conjunctivitis
  • H10.45 Other chronic allergic conjunctivitis
  • H10.501 Unspecified blepharoconjunctivitis, right eye
  • H10.502 Unspecified blepharoconjunctivitis, left eye
  • H10.503 Unspecified blepharoconjunctivitis, bilateral
  • H10.509 Unspecified blepharoconjunctivitis, unspecified eye
  • H10.511 Ligneous conjunctivitis, right eye
  • H10.512 Ligneous conjunctivitis, left eye
  • H10.513 Ligneous conjunctivitis, bilateral
  • H10.519 Ligneous conjunctivitis, unspecified eye
  • H10.521 Angular blepharoconjunctivitis, right eye
  • H10.522 Angular blepharoconjunctivitis, left eye
  • H10.523 Angular blepharoconjunctivitis, bilateral
  • H10.529 Angular blepharoconjunctivitis, unspecified eye
  • H10.531 Contact blepharoconjunctivitis, right eye
  • H10.532 Contact blepharoconjunctivitis, left eye
  • H10.533 Contact blepharoconjunctivitis, bilateral
  • H10.539 Contact blepharoconjunctivitis, unspecified eye
  • H10.811 Pingueculitis, right eye
  • H10.812 Pingueculitis, left eye
  • H10.813 Pingueculitis, bilateral
  • H10.819 Pingueculitis, unspecified eye
  • H10.821 Rosacea conjunctivitis, right eye
  • H10.822 Rosacea conjunctivitis, left eye
  • H10.823 Rosacea conjunctivitis, bilateral
  • H10.829 Rosacea conjunctivitis, unspecified eye
  • H10.89 Other conjunctivitis

Common questions about conjunctivitis ICD-10 codes

What is the ICD-10 code for conjunctivitis?

H10.9 — Unspecified conjunctivitis. More specific codes apply when the documentation supports them: H10.011, H10.012, H10.013, H10.019 and others below.

What is the ICD-10 code for acute follicular conjunctivitis, right eye?

H10.011 — Acute follicular conjunctivitis, right eye.

What is the ICD-10 code for acute follicular conjunctivitis, left eye?

H10.012 — Acute follicular conjunctivitis, left eye.

What is the ICD-10 code for acute follicular conjunctivitis, bilateral?

H10.013 — Acute follicular conjunctivitis, bilateral.

What is the ICD-10 code for acute follicular conjunctivitis, unspecified eye?

H10.019 — Acute follicular conjunctivitis, unspecified eye.

What is the ICD-10 code for other mucopurulent conjunctivitis, right eye?

H10.021 — Other mucopurulent conjunctivitis, right eye.

What is the ICD-10 code for other mucopurulent conjunctivitis, left eye?

H10.022 — Other mucopurulent conjunctivitis, left eye.

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.