2021 ICD-10-CM Diagnosis Code H20.1

Chronic iridocyclitis

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • H20.1 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 H20.1 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of H20.1 - other international versions of ICD-10 H20.1 may differ.
Use Additional
Use Additional Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the 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.
  • code for any associated cataract (
    ICD-10-CM Diagnosis Code H26.21

    Cataract with neovascularization

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Code Also
    • associated condition, such as:
    • chronic iridocyclitis (H20.1-)
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (H20.1) and the excluded code together.
  • posterior cyclitis (
    ICD-10-CM Diagnosis Code H30.2

    Posterior cyclitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Applicable To
    • Pars planitis
The following code(s) above H20.1 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 H20.1:
  • H00-H59
    2021 ICD-10-CM Range H00-H59

    Diseases of the eye and adnexa

    • 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
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
Code annotations containing back-references to H20.1:
  • Code Also: H26.21
    ICD-10-CM Diagnosis Code H26.21

    Cataract with neovascularization

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Code Also
    • associated condition, such as:
    • chronic iridocyclitis (H20.1-)

Diagnosis Index entries containing back-references to H20.1:
  • Iridocyclitis H20.9
    ICD-10-CM Diagnosis Code H20.9

    Unspecified iridocyclitis

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Uveitis NOS
    • chronic H20.1-

ICD-10-CM Codes Adjacent To H20.1
H20.04 Secondary noninfectious iridocyclitis
H20.041 …… right eye
H20.042 …… left eye
H20.043 …… bilateral
H20.049 …… unspecified eye
H20.05 Hypopyon
H20.051 …… right eye
H20.052 …… left eye
H20.053 …… bilateral
H20.059 …… unspecified eye
H20.1 Chronic iridocyclitis
H20.10 …… unspecified eye
H20.11 …… right eye
H20.12 …… left eye
H20.13 …… bilateral
H20.2 Lens-induced iridocyclitis
H20.20 …… unspecified eye
H20.21 …… right eye
H20.22 …… left eye
H20.23 …… bilateral
H20.8 Other iridocyclitis

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