ICD-10-CM 2027 diagnosis code
H02.51Abnormal innervation syndrome
H02.51 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About H02.51
H02.51 is the ICD-10-CM diagnosis code for abnormal innervation syndrome. It belongs to category H02 (other disorders of eyelid), block H00-H05 (disorders of eyelid, lacrimal system and orbit) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.
Within H02.5 (other disorders affecting eyelid function), H02.51 is specifically for abnormal innervation syndrome. Related codes cover Blepharophimosis (H02.52), eyelid retraction (H02.53) and other disorders affecting eyelid function (H02.59).
To report this condition, pick the subcode that matches the documentation: H02.511 (right upper eyelid), H02.512 (right lower eyelid), H02.513 (right eye, unspecified eyelid), H02.514 (left upper eyelid), H02.515 (left lower eyelid), H02.516 (left eye, unspecified eyelid) and H02.519 (unspecified eye, unspecified eyelid).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under H02.51
- H02.511Abnormal innervation syndrome right upper eyelidBillable
- H02.512Abnormal innervation syndrome right lower eyelidBillable
- H02.513Abnormal innervation syndrome right eye, unspecified eyelidBillable
- H02.514Abnormal innervation syndrome left upper eyelidBillable
- H02.515Abnormal innervation syndrome left lower eyelidBillable
- H02.516Abnormal innervation syndrome left eye, unspecified eyelidBillable
- H02.519Abnormal innervation syndrome unspecified eye, unspecified eyelidBillable
Notes that apply from higher levels
Instructions written at a parent level also apply to H02.51.
Broader instructions also apply from H00-H05 Disorders of eyelid, lacrimal system and orbit and Chapter 7: Diseases of the eye and adnexa.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about H02.51
Is H02.51 billable?
- No. H02.51 is a header code. Report one of its more specific subcodes instead.