conjunctivitis

DEFINITION of conjunctivitis

Conjunctivitis is the inflammation of the conjunctiva, the mucous membrane that lines the anterior surface of the globe (bulbar conjunctiva) and the posterior surface of the eyelids (palpebral conjunctiva). It is the most common cause of a “red eye.”

• Etiology: It can be caused by:
  • Viruses: Most common cause (e.g., Adenovirus); highly contagious, often associated with upper respiratory infections.
  • Bacteria: (e.g., [[Staphylococcus]] aureus, Streptococcus pneumoniae, Haemophilus influenzae); typically produces purulent (pus-like) discharge.
  • Allergens: (e.g., pollen, dust mites); bilateral, intensely itchy, watery discharge; not contagious.
  • Irritants: Chemicals, smoke, foreign bodies, or contact lens overwear.
  • Sexually Transmitted Infections: Chlamydia trachomatis (Trachoma/Inclusion conjunctivitis) or Neisseria gonorrhoeae (hyperacute, severe).
• Symptoms: Erythema (redness), chemosis (swelling), foreign body sensation, grittiness, photophobia (mild), and discharge ranging from watery to thick purulent.
• Complications: While usually self-limiting, severe cases (especially gonococcal or chlamydial) can lead to corneal ulceration and vision loss if untreated.

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ETYMOLOGY of conjunctivitis

latin Derived from two parts:

• conjunctiva: From the Latin conjungere, meaning “to join together.” It refers to the membrane that “joins” the eyeball to the eyelid.
• -itis: A Greek suffix meaning “inflammation.”
• Literally translates to “inflammation of the joining membrane.”

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RELATED TERMS

• Keratoconjunctivitis: Inflammation involving both the conjunctiva and the cornea (more serious).
• Blepharoconjunctivitis: Inflammation of both the eyelids (blepharitis) and the conjunctiva.
• Chemosis: edema (swelling) of the conjunctiva, making it look gelatinous.
• Subconjunctival Hemorrhage: Bleeding under the conjunctiva; looks dramatic but is distinct from conjunctivitis (usually painless and no discharge).
• Ophthalmia Neonatorum: Conjunctivitis occurring in the first 28 days of life, often due to exposure to pathogens during birth.
• Giant Papillary Conjunctivitis (GPC): Often associated with contact lens wear or ocular prosthetics.

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CODING AND NUANCES

ICD-10-CM Codes Note: Specificity regarding the cause (viral, bacterial, allergic) and laterality (right, left, bilateral) is required.

Viral Conjunctivitis (B30.-)

• B30.0: Keratoconjunctivitis due to adenovirus

• B30.1: Conjunctivitis due to adenovirus

• B30.2: Viral pharyngoconjunctivitis

• B30.3: Acute epidemic hemorrhagic conjunctivitis (enteroviral)

• B30.8: Other viral conjunctivitis

• B30.9: Viral conjunctivitis, unspecified

  • Laterality modifiers are applied at the 6th/7th character level in some systems, but B30 codes often require an additional code from category H10.- if not integrated. Wait, B30 is the etiology. The manifestation code is usually H10.- with the organism specified. Let’s correct to the standard H10 series which includes etiology in modern ICD-10-CM.
  • Correction: In ICD-10-CM, conjunctivitis is primarily coded under H10. The organism is often indicated by the specific H10 code or an additional B code.
  • H10.0-: Mucopurulent conjunctivitis (Often bacterial)
  • H10.1-: Acute atopic conjunctivitis
  • H10.2-: Other acute conjunctivitis
  • H10.3-: Unspecified acute conjunctivitis
  • H10.4-: Chronic conjunctivitis
  • H10.5-: Blepharoconjunctivitis
  • H10.8-: Other conjunctivitis
  • H10.9-: Unspecified conjunctivitis

  Refined Specific Codes (2026 Standard):

  • H10.01-: Mucopurulent conjunctivitis, right eye
  • H10.02-: Mucopurulent conjunctivitis, left eye
  • H10.03-: Mucopurulent conjunctivitis, bilateral
  • H10.11-: Acute atopic conjunctivitis, right eye
  • H10.12-: … left eye
  • H10.13-: … bilateral
  • H10.21-: Other acute conjunctivitis, right eye (Often used for Viral if not specified as adenovirus)
  • H10.22-: … left eye
  • H10.23-: … bilateral
  • H10.31-: Unspecified acute conjunctivitis, right eye
  • H10.32-: … left eye
  • H10.33-: … bilateral
  • H10.41-: Chronic conjunctivitis, right eye
  • H10.42-: … left eye
  • H10.43-: … bilateral
  • H10.51-: Blepharoconjunctivitis, right eye
  • H10.52-: … left eye
  • H10.53-: … bilateral
  • H10.81-: Other conjunctivitis, right eye
  • H10.82-: … left eye
  • H10.83-: … bilateral
  • H10.9-: Unspecified conjunctivitis (Use only if laterality unknown, though rare in practice).

  For specific organisms (e.g., Adenovirus), code B30.9 (Viral conjunctivitis unspecified) or B30.1 + H10.2-? Actually, ICD-10-CM often combines these. If “Adenoviral conjunctivitis” is documented, use B30.1. If “Viral conjunctivitis NOS”, use H10.3-.

  • B30.0: Keratoconjunctivitis due to adenovirus
  • B30.1: Conjunctivitis due to adenovirus
  • B30.2: Viral pharyngoconjunctivitis
  • B30.3: Acute epidemic hemorrhagic conjunctivitis
  • B30.8: Other viral conjunctivitis
  • B30.9: Viral conjunctivitis, unspecified (Note: When a specific virus like Adenovirus is identified, the B30 code takes precedence or is used in conjunction depending on coding guidelines. Usually, B30.1 is sufficient for Adenoviral conjunctivitis).

Allergic Conjunctivitis (H10.4- is chronic, but acute allergic is H10.1 or H10.2?)

• Actually, Allergic Conjunctivitis has specific codes under H10.1 (Acute atopic) and H10.4 (Chronic).
• H10.11: Acute atopic conjunctivitis, right eye
• H10.12: … left eye
• H10.13: … bilateral
• H10.41: Chronic conjunctivitis (often allergic) right eye.
• Wait, there is a specific category for Allergic Conjunctivitis?
  • Yes, H10.1 is Acute Atopic Conjunctivitis.
  • H10.2 is Other Acute Conjunctivitis.
  • H10.4 is Chronic Conjunctivitis.
  • There isn’t a generic “Allergic” code other than Atopic or Chronic. If “Allergic conjunctivitis” is documented without “atopic,” it often falls under H10.2 (Other acute) or H10.4 (Chronic) depending on duration, or H10.8 (Other).
  • _Correction:_ H10.1 is specifically “Acute atopic conjunctivitis”. Simple “Allergic conjunctivitis” is often coded as H10.2 (Other acute conjunctivitis) or H10.4 (Chronic).

CPT Codes CPT codes depend on the level of service (exam) or procedures performed (foreign body removal, culture).

Evaluation and Management (E/M)

• 99202-99215: Office or other outpatient visit (New or Established patient). Used for the diagnosis and prescription of drops.
• 92002-92014: Ophthalmological services (Medical examination and evaluation). Used by eye specialists (OD/MD).
  • 92002: New patient, intermediate.
  • 92004: New patient, comprehensive.
  • 92012: Established patient, intermediate.
  • 92014: Established patient, comprehensive.

Procedures

• 65205: Removal of foreign body, external eye; conjunctival superficial. (If a foreign body causing irritant conjunctivitis is removed).
• 65222: Removal of foreign body, external eye; conjunctival embedded (incision required).
• 87070: Culture, bacterial; screening isolate only. (If a swab is taken to identify the bacteria).
• 87081: Culture, bacterial; isolated colonies, identification and sensitivity. (Full culture and sensitivity).
• 87430: Infectious agent antigen detection by immunoassay technique (e.g., for Chlamydia or Gonorrhea).
• 87631: Infectious agent detection by nucleic acid (DNA or RNA); Chlamydia trachomatis (PCR test).
• 87632: … Neisseria gonorrhoeae.

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DERIVATIONS of conjunctivitis

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Query functionality

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Med roots Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms