2027 ICD-10-CM Diagnosis Code H18.012Anterior corneal pigmentations, left eye
ICD-10-CM Codes›H00–H59›H15-H22›H18
- Billable — Valid for Submission
- Not Chronic
H18.012 is a billable ICD-10-CM diagnosis code for anterior corneal pigmentations, left eye. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. Coders also document this condition as anterior corneal pigmentation. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anterior corneal pigmentation
- Benign neoplasm of cornea
- Benign neoplasm of left cornea
- Left anterior corneal pigmentation
- Primary acquired melanosis of cornea
- Primary acquired melanosis of cornea of left eye
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to H18.012: its own notes plus those printed at Chapter 7. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Corneal Disorders
Your cornea is the outermost layer of your eye. It is clear and shaped like a dome. The cornea helps to shield the rest of the eye from germs, dust, and other harmful matter. It also helps your eye to focus. If you wear contact lenses, they float on top of your corneas.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert H18.012 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H18.012Overview
What is the ICD-10 code for anterior corneal pigmentations, left eye?
The ICD-10-CM code for anterior corneal pigmentations, left eye is H18.012 (sometimes written as H18012). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is H18.012 (Anterior corneal pigmentations) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anterior corneal pigmentations, left eye on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does H18.012 group to?
When anterior corneal pigmentations, left eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of H18.012?
Under the General Equivalence Mappings, anterior corneal pigmentations, left eye converts to ICD-9-CM 371.11 (ant cornea pigmentation). The mapping is approximate, so confirm the match fits the documentation.
