Chapter 7

H00–H59: Diseases of the Eye and Adnexa

Diseases of the Eye and Adnexa diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)
All CodesBillable Only
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Internal Codes
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  • H00—

    Hordeolum and chalazion

  • H00.0—

    Hordeolum (externum) (internum) of eyelid

  • H00.01—

    Hordeolum externum

  • H00.011—

    Hordeolum externum right upper eyelid

  • H00.012—

    Hordeolum externum right lower eyelid

  • H00.013—

    Hordeolum externum right eye, unspecified eyelid

  • H00.014—

    Hordeolum externum left upper eyelid

  • H00.015—

    Hordeolum externum left lower eyelid

  • H00.016—

    Hordeolum externum left eye, unspecified eyelid

  • H00.019—

    Hordeolum externum unspecified eye, unspecified eyelid

  • H00.02—

    Hordeolum internum

  • H00.021—

    Hordeolum internum right upper eyelid

  • H00.022—

    Hordeolum internum right lower eyelid

  • H00.023—

    Hordeolum internum right eye, unspecified eyelid

  • H00.024—

    Hordeolum internum left upper eyelid

  • H00.025—

    Hordeolum internum left lower eyelid

  • H00.026—

    Hordeolum internum left eye, unspecified eyelid

  • H00.029—

    Hordeolum internum unspecified eye, unspecified eyelid

  • H00.03—

    Abscess of eyelid

  • H00.031—

    Abscess of right upper eyelid

  • H00.032—

    Abscess of right lower eyelid

  • H00.033—

    Abscess of eyelid right eye, unspecified eyelid

  • H00.034—

    Abscess of left upper eyelid

  • H00.035—

    Abscess of left lower eyelid

  • H00.036—

    Abscess of eyelid left eye, unspecified eyelid

  • H00.039—

    Abscess of eyelid unspecified eye, unspecified eyelid

  • H00.1—

    Chalazion

  • H00.11—

    Chalazion right upper eyelid

  • H00.12—

    Chalazion right lower eyelid

  • H00.13—

    Chalazion right eye, unspecified eyelid

  • H00.14—

    Chalazion left upper eyelid

  • H00.15—

    Chalazion left lower eyelid

  • H00.16—

    Chalazion left eye, unspecified eyelid

  • H00.19—

    Chalazion unspecified eye, unspecified eyelid

  • H01—

    Other inflammation of eyelid

  • H01.0—

    Blepharitis

  • H01.00—

    Unspecified blepharitis

  • H01.001—

    Unspecified blepharitis right upper eyelid

  • H01.002—

    Unspecified blepharitis right lower eyelid

  • H01.003—

    Unspecified blepharitis right eye, unspecified eyelid

  • H01.004—

    Unspecified blepharitis left upper eyelid

  • H01.005—

    Unspecified blepharitis left lower eyelid

  • H01.006—

    Unspecified blepharitis left eye, unspecified eyelid

  • H01.009—

    Unspecified blepharitis unspecified eye, unspecified eyelid

  • H01.00A—

    Unspecified blepharitis right eye, upper and lower eyelids

  • H01.00B—

    Unspecified blepharitis left eye, upper and lower eyelids

  • H01.01—

    Ulcerative blepharitis

  • H01.011—

    Ulcerative blepharitis right upper eyelid

  • H01.012—

    Ulcerative blepharitis right lower eyelid

  • H01.013—

    Ulcerative blepharitis right eye, unspecified eyelid

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