2020 ICD-10-CM Diagnosis Code H49.2

Sixth [abducent] nerve palsy

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • H49.2 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM H49.2 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of H49.2 - other international versions of ICD-10 H49.2 may differ.
The following code(s) above H49.2 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 H49.2:
  • H00-H59
    2020 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
  • H49-H52
    2020 ICD-10-CM Range H49-H52

    Disorders of ocular muscles, binocular movement, accommodation and refraction

    Type 2 Excludes
    • nystagmus and other irregular eye movements (H55)
    Disorders of ocular muscles, binocular movement, accommodation and refraction
  • H49
    ICD-10-CM Diagnosis Code H49

    Paralytic strabismus

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • internal ophthalmoplegia (H52.51-)
    • internuclear ophthalmoplegia (H51.2-)
    • progressive supranuclear ophthalmoplegia (G23.1)
    Paralytic strabismus
Clinical Information
  • A disorder characterized by involvement of the abducens nerve (sixth cranial nerve).
  • A non-neoplastic or neoplastic disorder affecting the abducens nerve (sixth cranial nerve).
  • Diseases of the sixth cranial (abducens) nerve or its nucleus in the pons. The nerve may be injured along its course in the pons, intracranially as it travels along the base of the brain, in the cavernous sinus, or at the level of superior orbital fissure or orbit. Dysfunction of the nerve causes lateral rectus muscle weakness, resulting in horizontal diplopia that is maximal when the affected eye is abducted and esotropia. Common conditions associated with nerve injury include intracranial hypertension; craniocerebral trauma; ischemia; and infratentorial neoplasms.
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
Code annotations containing back-references to H49.2:
  • Type 2 Excludes: G52
    ICD-10-CM Diagnosis Code G52

    Disorders of other cranial nerves

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • disorders of acoustic [8th] nerve (H93.3)
    • disorders of optic [2nd] nerve (H46, H47.0)
    • paralytic strabismus due to nerve palsy (H49.0-H49.2)

Diagnosis Index entries containing back-references to H49.2:
  • Strabismus (congenital) (nonparalytic) H50.9
    ICD-10-CM Diagnosis Code H50.9

    Unspecified strabismus

      2016 2017 2018 2019 2020 Billable/Specific Code
    • paralytic H49.9
      ICD-10-CM Diagnosis Code H49.9

      Unspecified paralytic strabismus

        2016 2017 2018 2019 2020 Billable/Specific Code
      • abducens nerve H49.2-
      • sixth nerve H49.2-

ICD-10-CM Codes Adjacent To H49.2
H49.0 Third [oculomotor] nerve palsy
H49.00 …… unspecified eye
H49.01 …… right eye
H49.02 …… left eye
H49.03 …… bilateral
H49.1 Fourth [trochlear] nerve palsy
H49.10 …… unspecified eye
H49.11 …… right eye
H49.12 …… left eye
H49.13 …… bilateral
H49.2 Sixth [abducent] nerve palsy
H49.20 …… unspecified eye
H49.21 …… right eye
H49.22 …… left eye
H49.23 …… bilateral
H49.3 Total (external) ophthalmoplegia
H49.30 …… unspecified eye
H49.31 …… right eye
H49.32 …… left eye
H49.33 …… bilateral
H49.4 Progressive external ophthalmoplegia

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