2027 ICD-10-CM Diagnosis Code H35.00Unspecified background retinopathy
ICD-10-CM Codes›H00–H59›H30-H36›H35
- Billable — Valid for Submission
- Chronic Condition
H35.00 is a billable ICD-10-CM diagnosis code for unspecified background retinopathy. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute zonal occult outer retinopathy
- Adverse reaction to Cinchona alkaloid
- Aminoquinoline antimalarial adverse reaction
- Autosomal recessive chorioretinopathy and microcephaly syndrome
- Background retinopathy due to impaired glucose regulation
- Bilateral retinopathy
- Bilateral retinopathy of eyes caused by hydroxychloroquine
- Chelating agent adverse reaction
- Chloroquine adverse reaction
- Chloroquine retinopathy
- Desferrioxamine adverse reaction
- Desferrioxamine retinopathy
- Disorder of blood vessel of retina of left eye
- Disorder of blood vessel of retina of right eye
- Estrogen antagonist adverse reaction
- Familial aplasia of the vermis
- Hereditary vitreoretinopathy
- Hydrochloroquine retinopathy
- Hydroxychloroquine adverse reaction
- Joubert syndrome
- Joubert syndrome with ocular defect
- Osteogenesis imperfecta, retinopathy, seizures, intellectual disability syndrome
- Paraneoplastic retinopathy
- Quinine adverse reaction
- Quinine retinopathy
- Renal retinopathy
- Retinal vascular disorder
- Retinal vasculopathy with cerebral leukoencephalopathy and systemic manifestations
- Retinopathy caused by canthaxanthin
- Retinopathy caused by trifluoperazine
- Retinopathy due to atherosclerosis
- Retinopathy of left eye caused by hydroxychloroquine
- Retinopathy of right eye caused by hydroxychloroquine
- Small vessel cerebrovascular disease
- Tamoxifen adverse reaction
- Tamoxifen retinopathy
- Thioridazine adverse reaction
- Thioridazine retinopathy
- Trifluoperazine adverse reaction
- Vascular retinopathy of bilateral eyes
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to H35.00: its own notes plus those printed at H35.0, H35, and 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)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name H35.00, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming H35.00: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 4
These codes carry an Excludes2 note naming H35.00: its condition is not part of those codes, and both may be reported when the patient has both.
- I10 Essential (primary) hypertensionessential (primary) hypertension involving vessels of eye (H35.0-) names H35.0-, which includes this code
- I15 Secondary hypertensionsecondary hypertension involving vessels of eye (H35.0-) names H35.0-, which includes this code
- I72 Other aneurysmretinal aneurysm (H35.0) names H35.0, which includes this code
- I86 Varicose veins of other sitesretinal varices (H35.0-) names H35.0-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Retinopathy (background) H35.00
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Retinal Disorders
Retinal disorders are conditions that affect the retina, the thin light-sensitive tissue at the back of your eye. The retina senses light and sends signals to your brain so you can see.
The full article covers:
- What are retinal disorders?
- What causes retinal disorders?
- What are common retinal disorders?
- What are the symptoms of retinal disorders?
- How are retinal disorders diagnosed?
- How are retinal disorders treated?
- Can retinal disorders be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert H35.00 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H35.00Overview
What is the ICD-10 code for unspecified background retinopathy?
The ICD-10-CM code for unspecified background retinopathy is H35.00 (sometimes written as H3500). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is H35.00 (Background retinopathy and retinal vascular changes) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified background retinopathy on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does H35.00 group to?
When unspecified background retinopathy 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 H35.00?
Under the General Equivalence Mappings, unspecified background retinopathy converts to ICD-9-CM 362.10 (backgrnd retinopathy NOS). The mapping is a direct match.
