2021 ICD-10-CM Diagnosis Code H10.21

Acute toxic conjunctivitis

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • H10.21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2021 edition of ICD-10-CM H10.21 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of H10.21 - other international versions of ICD-10 H10.21 may differ.
Applicable To
  • Acute chemical conjunctivitis
Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • (T51-T65
    ICD-10-CM Range T51-T65

    Toxic effects of substances chiefly nonmedicinal as to source

    Note
    • When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.
    Type 1 Excludes
    • contact with and (suspected) exposure to toxic substances (Z77.-)
    Use Additional
    • code(s):
    • for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
    • personal history of foreign body fully removed (Z87.821)
    • to identify any retained foreign body, if applicable (Z18.-)
    • T51 Toxic effect of alcohol
    • T52 Toxic effect of organic solvents
    • T53 Toxic effect of halogen derivatives of a...
    • T54 Toxic effect of corrosive substances
    • T55 Toxic effect of soaps and detergents
    • T56 Toxic effect of metals
    • T57 Toxic effect of other inorganic substanc...
    • T58 Toxic effect of carbon monoxide
    • T59 Toxic effect of other gases, fumes and v...
    • T60 Toxic effect of pesticides
    • T61 Toxic effect of noxious substances eaten...
    • T62 Toxic effect of other noxious substances...
    • T63 Toxic effect of contact with venomous an...
    • T64 Toxic effect of aflatoxin and other myco...
    • T65 Toxic effect of other and unspecified su...
    ) to identify chemical and intent
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as H10.21. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • burn and corrosion of eye and adnexa (
    ICD-10-CM Diagnosis Code T26
    • T26 Burn and corrosion confined to eye and adnexa...
      • T26.0 Burn of eyelid and periocular area
        • T26.00 Burn of unspecified eyelid and periocular are...
          • T26.00XA Burn of unspecified eyelid and periocular are...
          • T26.00XD Burn of unspecified eyelid and periocular are...
          • T26.00XS Burn of unspecified eyelid and periocular are...
        • T26.01 Burn of right eyelid and periocular area
          • T26.01XA Burn of right eyelid and periocular area, ini...
          • T26.01XD Burn of right eyelid and periocular area, sub...
          • T26.01XS Burn of right eyelid and periocular area, seq...
        • T26.02 Burn of left eyelid and periocular area
          • T26.02XA Burn of left eyelid and periocular area, init...
          • T26.02XD Burn of left eyelid and periocular area, subs...
          • T26.02XS Burn of left eyelid and periocular area, sequ...
      • T26.1 Burn of cornea and conjunctival sac
        • T26.10 Burn of cornea and conjunctival sac, unspecif...
          • T26.10XA Burn of cornea and conjunctival sac, unspecif...
          • T26.10XD Burn of cornea and conjunctival sac, unspecif...
          • T26.10XS Burn of cornea and conjunctival sac, unspecif...
        • T26.11 Burn of cornea and conjunctival sac, right ey...
          • T26.11XA Burn of cornea and conjunctival sac, right ey...
          • T26.11XD Burn of cornea and conjunctival sac, right ey...
          • T26.11XS Burn of cornea and conjunctival sac, right ey...
        • T26.12 Burn of cornea and conjunctival sac, left eye...
          • T26.12XA Burn of cornea and conjunctival sac, left eye...
          • T26.12XD Burn of cornea and conjunctival sac, left eye...
          • T26.12XS Burn of cornea and conjunctival sac, left eye...
      • T26.2 Burn with resulting rupture and destruction o...
        • T26.20 Burn with resulting rupture and destruction o...
          • T26.20XA Burn with resulting rupture and destruction o...
          • T26.20XD Burn with resulting rupture and destruction o...
          • T26.20XS Burn with resulting rupture and destruction o...
        • T26.21 Burn with resulting rupture and destruction o...
          • T26.21XA Burn with resulting rupture and destruction o...
          • T26.21XD Burn with resulting rupture and destruction o...
          • T26.21XS Burn with resulting rupture and destruction o...
        • T26.22 Burn with resulting rupture and destruction o...
          • T26.22XA Burn with resulting rupture and destruction o...
          • T26.22XD Burn with resulting rupture and destruction o...
          • T26.22XS Burn with resulting rupture and destruction o...
      • T26.3 Burns of other specified parts of eye and adn...
        • T26.30 Burns of other specified parts of unspecified...
          • T26.30XA Burns of other specified parts of unspecified...
          • T26.30XD Burns of other specified parts of unspecified...
          • T26.30XS Burns of other specified parts of unspecified...
        • T26.31 Burns of other specified parts of right eye a...
          • T26.31XA Burns of other specified parts of right eye a...
          • T26.31XD Burns of other specified parts of right eye a...
          • T26.31XS Burns of other specified parts of right eye a...
        • T26.32 Burns of other specified parts of left eye an...
          • T26.32XA Burns of other specified parts of left eye an...
          • T26.32XD Burns of other specified parts of left eye an...
          • T26.32XS Burns of other specified parts of left eye an...
      • T26.4 Burn of eye and adnexa, part unspecified
        • T26.40 Burn of unspecified eye and adnexa, part unsp...
          • T26.40XA Burn of unspecified eye and adnexa, part unsp...
          • T26.40XD Burn of unspecified eye and adnexa, part unsp...
          • T26.40XS Burn of unspecified eye and adnexa, part unsp...
        • T26.41 Burn of right eye and adnexa, part unspecifie...
          • T26.41XA Burn of right eye and adnexa, part unspecifie...
          • T26.41XD Burn of right eye and adnexa, part unspecifie...
          • T26.41XS Burn of right eye and adnexa, part unspecifie...
        • T26.42 Burn of left eye and adnexa, part unspecified...
          • T26.42XA Burn of left eye and adnexa, part unspecified...
          • T26.42XD Burn of left eye and adnexa, part unspecified...
          • T26.42XS Burn of left eye and adnexa, part unspecified...
      • T26.5 Corrosion of eyelid and periocular area
        • T26.50 Corrosion of unspecified eyelid and periocula...
          • T26.50XA Corrosion of unspecified eyelid and periocula...
          • T26.50XD Corrosion of unspecified eyelid and periocula...
          • T26.50XS Corrosion of unspecified eyelid and periocula...
        • T26.51 Corrosion of right eyelid and periocular area...
          • T26.51XA Corrosion of right eyelid and periocular area...
          • T26.51XD Corrosion of right eyelid and periocular area...
          • T26.51XS Corrosion of right eyelid and periocular area...
        • T26.52 Corrosion of left eyelid and periocular area
          • T26.52XA Corrosion of left eyelid and periocular area,...
          • T26.52XD Corrosion of left eyelid and periocular area,...
          • T26.52XS Corrosion of left eyelid and periocular area,...
      • T26.6 Corrosion of cornea and conjunctival sac
        • T26.60 Corrosion of cornea and conjunctival sac, uns...
          • T26.60XA Corrosion of cornea and conjunctival sac, uns...
          • T26.60XD Corrosion of cornea and conjunctival sac, uns...
          • T26.60XS Corrosion of cornea and conjunctival sac, uns...
        • T26.61 Corrosion of cornea and conjunctival sac, rig...
          • T26.61XA Corrosion of cornea and conjunctival sac, rig...
          • T26.61XD Corrosion of cornea and conjunctival sac, rig...
          • T26.61XS Corrosion of cornea and conjunctival sac, rig...
        • T26.62 Corrosion of cornea and conjunctival sac, lef...
          • T26.62XA Corrosion of cornea and conjunctival sac, lef...
          • T26.62XD Corrosion of cornea and conjunctival sac, lef...
          • T26.62XS Corrosion of cornea and conjunctival sac, lef...
      • T26.7 Corrosion with resulting rupture and destruct...
        • T26.70 Corrosion with resulting rupture and destruct...
          • T26.70XA Corrosion with resulting rupture and destruct...
          • T26.70XD Corrosion with resulting rupture and destruct...
          • T26.70XS Corrosion with resulting rupture and destruct...
        • T26.71 Corrosion with resulting rupture and destruct...
          • T26.71XA Corrosion with resulting rupture and destruct...
          • T26.71XD Corrosion with resulting rupture and destruct...
          • T26.71XS Corrosion with resulting rupture and destruct...
        • T26.72 Corrosion with resulting rupture and destruct...
          • T26.72XA Corrosion with resulting rupture and destruct...
          • T26.72XD Corrosion with resulting rupture and destruct...
          • T26.72XS Corrosion with resulting rupture and destruct...
      • T26.8 Corrosions of other specified parts of eye an...
        • T26.80 Corrosions of other specified parts of unspec...
          • T26.80XA Corrosions of other specified parts of unspec...
          • T26.80XD Corrosions of other specified parts of unspec...
          • T26.80XS Corrosions of other specified parts of unspec...
        • T26.81 Corrosions of other specified parts of right ...
          • T26.81XA Corrosions of other specified parts of right ...
          • T26.81XD Corrosions of other specified parts of right ...
          • T26.81XS Corrosions of other specified parts of right ...
        • T26.82 Corrosions of other specified parts of left e...
          • T26.82XA Corrosions of other specified parts of left e...
          • T26.82XD Corrosions of other specified parts of left e...
          • T26.82XS Corrosions of other specified parts of left e...
      • T26.9 Corrosion of eye and adnexa, part unspecified...
        • T26.90 Corrosion of unspecified eye and adnexa, part...
          • T26.90XA Corrosion of unspecified eye and adnexa, part...
          • T26.90XD Corrosion of unspecified eye and adnexa, part...
          • T26.90XS Corrosion of unspecified eye and adnexa, part...
        • T26.91 Corrosion of right eye and adnexa, part unspe...
          • T26.91XA Corrosion of right eye and adnexa, part unspe...
          • T26.91XD Corrosion of right eye and adnexa, part unspe...
          • T26.91XS Corrosion of right eye and adnexa, part unspe...
        • T26.92 Corrosion of left eye and adnexa, part unspec...
          • T26.92XA Corrosion of left eye and adnexa, part unspec...
          • T26.92XD Corrosion of left eye and adnexa, part unspec...
          • T26.92XS Corrosion of left eye and adnexa, part unspec...
    T26.-
    )
The following code(s) above H10.21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to H10.21:
  • H00-H59
    2021 ICD-10-CM Range H00-H59

    Diseases of the eye and adnexa

    Note
    • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition
    Type 2 Excludes
    • 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)
    Diseases of the eye and adnexa
  • H10
    ICD-10-CM Diagnosis Code H10

    Conjunctivitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Conjunctivitis
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to H10.21:
  • Conjunctivitis (staphylococcal) (streptococcal) H10.9
    ICD-10-CM Diagnosis Code H10.9

    Unspecified conjunctivitis

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    • acute H10.3-
      ICD-10-CM Diagnosis Code H10.3-

      Unspecified acute conjunctivitis

        2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
      Type 1 Excludes
      • ophthalmia neonatorum NOS (P39.1)
    • chemical H10.21- (acute) - see also Corrosion, cornea

ICD-10-CM Codes Adjacent To H10.21
H10.021 …… right eye
H10.022 …… left eye
H10.023 …… bilateral
H10.029 …… unspecified eye
H10.1 Acute atopic conjunctivitis
H10.10 …… unspecified eye
H10.11 …… right eye
H10.12 …… left eye
H10.13 …… bilateral
H10.2 Other acute conjunctivitis
H10.21 Acute toxic conjunctivitis
H10.211 …… right eye
H10.212 …… left eye
H10.213 …… bilateral
H10.219 …… unspecified eye
H10.22 Pseudomembranous conjunctivitis
H10.221 …… right eye
H10.222 …… left eye
H10.223 …… bilateral
H10.229 …… unspecified eye
H10.23 Serous conjunctivitis, except viral

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.