2027 ICD-10-CM Diagnosis Code H31.422Serous choroidal detachment, left eye

ICD-10-CM Codes›H00–H59›H30-H36›H31

ICD-10-CM H31.422
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H31.422 is a billable ICD-10-CM diagnosis code for serous choroidal detachment, 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 26 closely related codes. Coders also document this condition as choroidal detachment of left eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Retinal and vitreous conditions.

Code Identity

ICD-10-CM Code
H31.422
Billable Status
Yes — Valid for Submission
Code Describes
Serous choroidal detachment, left eye
Short Description
Serous choroidal detachment, left eye
Same as the full description in the CMS dataset.
Parent Code
H31.42
Serous choroidal detachment

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH30-H36Disorders of choroid and retina
CategoryH31Other disorders of choroid
This CodeH31.422Serous choroidal detachment, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Choroidal detachment of left eye
  • Serous choroidal detachment
  • Serous choroidal detachment of left eye

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H31.422: 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.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • 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.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • 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 H31.422, its category, or a range that includes it.

Use Additional Code 1

These codes say to use an additional code from the note, and H31.422 is one of the codes named.

  • H44.2A Degenerative myopia with choroidal neovascularization
    code for any associated choroid disorders (H31.-) names H31.-, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE005
Retinal and vitreous conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Choroidal Detachment

    a detachment of the choroid from the sclera often due to the accumulation of fluid (blood for hemorrhagic, other fluids for serous detachment) in the suprachoroidal space.

Patient EducationClinical

Eye Diseases

Even if your eyes feel healthy, you could have a problem and not know it. That's why regular eye exams are so important. Refractive errors are the most common type of vision problem that makes it hard to see clearly. But some eye conditions or diseases don't have any symptoms and can lead to a permanent loss of vision.

The full article covers:

  • What diseases can affect the eye?
  • What are the symptoms of eye diseases?
  • Who is more likely to develop eye diseases?
  • What are the treatments for eye diseases?
  • Can eye diseases be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H31.422 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
363.71 Serous choroid detachmnt
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H31.422Overview

What is the ICD-10 code for serous choroidal detachment, left eye?

The ICD-10-CM code for serous choroidal detachment, left eye is H31.422 (sometimes written as H31422). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H31.422 (Serous choroidal detachment) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report serous choroidal detachment, left eye on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H31.422 group to?

When serous choroidal detachment, 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.

Is H31.422 a CC or MCC?

CMS lists H31.422 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 26 closely related codes in its exclusion list.

What is the ICD-9 equivalent of H31.422?

Under the General Equivalence Mappings, serous choroidal detachment, left eye converts to ICD-9-CM 363.71 (serous choroid detachmnt). The mapping is approximate, so confirm the match fits the documentation.