Crystal's MCW Coder Hub🧬 ICD-10-CM H31.401 — Unspecified Choroidal Detachment, Right Eye
Quick Reference
Code: H31.401 Type: ICD-10-CM Diagnosis Status: ✅ Billable | Valid FY2026 Chapter: H00-H59 — Diseases of the Eye and Adnexa Laterality: Right Eye HCC Mapped: ❌ No — Not mapped under CMS-HCC V28 MS-DRG: 124 / 125 / 126 (dependent on CC/MCC)
🩺 Clinical Description
Choroidal detachment occurs when fluid or blood accumulates in the suprachoroidal space — the potential space between the choroid and the sclera — causing the choroid to separate from the overlying retinal pigment epithelium (RPE) or the underlying sclera.Onlinelibrary.wiley.com 2018 The choroid is the highly vascular middle layer of the eye responsible for supplying blood and oxygen to the outer retina, making any detachment a potentially vision-threatening event that warrants urgent evaluation.
ICD-10 CM H31.401 is assigned when the type of choroidal detachment is not specified in the documentation — meaning the provider has not indicated whether it is serous (exudative) or hemorrhagic. This is an important distinction: if the record specifies one of those subtypes, a more specific code from H31.41x (hemorrhagic) or H31.42x (serous) should be selected instead. As a profee coder, you should always query the provider before defaulting to an unspecified code if the type can be determined from the clinical record, imaging, or operative notes.
Clinical Features & Presentation
- Patients typically present with decreased/blurred vision, visual field defects, and in severe cases, significant pain
- Fundoscopic exam reveals smooth, dome-shaped, brown/orange peripheral elevations of the choroid
- The detachments are often peripheral; very large detachments can cause the choroidal lobes to touch in the mid-vitreous (“kissing choroidal detachments”)
- B-scan ultrasonography is the gold-standard imaging modality for diagnosis and shows the characteristic smooth, convex echogenic detachment extending from the ciliary body region
- Optical coherence tomography (OCT) can help evaluate macular involvement
Common Etiologies
- Post-surgical hypotony (most common — especially following glaucoma filtering surgery, trabeculectomy, or vitreoretinal procedures)Eyewiki.org
- Ocular trauma (blunt or penetrating)
- Idiopathic serous effusion / uveal effusion syndrome
- Drug-induced (e.g., topical carbonic anhydrase inhibitors such as dorzolamide/timolol)PMC: Bilateral Choroidal Detachment NCBI Article PMC9944210, 2022
- Inflammatory/uveitic conditions
- Intraocular surgery complications (cataract extraction, scleral buckle)
- Systemic conditions (hypoalbuminemia, nephrotic syndrome)
🌳 Code Tree (Hierarchy)
H00-H59 Diseases of the Eye and Adnexa
└── H30-H36 Disorders of Choroid and Retina
└── H31 Other Disorders of Choroid
└── H31.4 Choroidal Detachment
├── H31.40 Unspecified Choroidal Detachment
│ ├── H31.401 ◀ RIGHT EYE — YOU ARE HERE ✅
│ ├── H31.402 Left Eye
│ ├── H31.403 Bilateral
│ └── H31.409 Unspecified Eye
├── H31.41 Hemorrhagic Choroidal Detachment
│ ├── H31.411 Right Eye
│ ├── H31.412 Left Eye
│ ├── H31.413 Bilateral
│ └── H31.419 Unspecified Eye
└── H31.42 Serous Choroidal Detachment
├── H31.421 Right Eye
├── H31.422 Left Eye
├── H31.423 Bilateral
└── H31.429 Unspecified Eye
6th Character — Laterality Key
| 6th Character | Meaning |
|---|---|
| 1 | Right Eye |
| 2 | Left Eye |
| 3 | Bilateral |
| 9 | Unspecified Eye |
Coding Tip — Laterality
Per ICD-10-CM Official Guidelines, laterality should always be coded to the highest degree of specificity supported by the documentation. If the record documents bilateral involvement, assign H31.403. Do not assign H31.409 (unspecified eye) if laterality is documented anywhere in the record — including imaging reports and operative notes.CMS ICD-10-CM Official Guidelines
✅ Includes Notes
(At the H31.401 code level — no specific Includes note is listed in the tabular.) (At the H31.4 subcategory level:)
- Choroidal detachment NOS (not otherwise specified) — applicable when documentation does not differentiate serous from hemorrhagic
- Applies to any separation of the choroid from adjacent structures of an undetermined or undocumented etiology in the right eyeAAPC Codify: ICD-10 H31.401, aapc.com
❌ Excludes Notes
No Excludes1 or Excludes2 at the H31.401 code level.
Excludes notes relevant to this code appear at the H31 category level and the H30-H36 block level.
Excludes2 — at block level H30-H36
(Excludes2 = “Not included here, but the patient may have both — code both if applicable”)
The following conditions are classified elsewhere and may be coded in addition to H31.401 if documented concurrently:
- Retinal detachment (→ H33.-) — Note: Retinal detachment is a distinct and separate entity from choroidal detachment, though they can co-occur
- Disorders of vitreous body (→ H43-H44)
Clinical Distinction — Don't Confuse These!
Retinal detachment (H33.x) ≠ Choroidal detachment (H31.4x). These are two distinct clinical entities with different pathophysiology, management, and coding. Retinal detachment involves the neurosensory retina separating from the RPE. Choroidal detachment involves the choroid separating from the sclera. Both can co-exist and both can be coded simultaneously if present and documented.
⚕️ HCC Information (Risk Adjustment)
| Field | Detail |
|---|---|
| HCC Mapped? | ❌ No |
| CMS-HCC Model | V28 (fully implemented CY2026) |
| HCC Category | None — H31.401 does not map to a Hierarchical Condition Category |
| RAF Impact | None — does not contribute to Risk Adjustment Factor score |
HCC Context for CY2026
CMS fully transitioned to CMS-HCC Model V28 in CY2026, completing its 3-year phase-in.BCAMedPAC Unlike retinal conditions such as proliferative diabetic retinopathy (H35.351-H35.359, mapped to HCC 122) or retinal detachment (H33.x codes, mapped to HCC 123), unspecified choroidal detachment codes do not carry HCC weight under V28. This means that from a Medicare Advantage risk adjustment standpoint, documenting and coding H31.401 alone will not increase a patient’s RAF score or drive additional plan reimbursement. Providers should still document the condition accurately, but risk adjustment coders should not expect this code to trigger a hierarchical contribution.
🏥 MS-DRG (Inpatient)
Applicable when H31.401 is coded in the inpatient hospital setting — relevant for your inpatient profee work!
| MS-DRG | Title | MDC | Type |
|---|---|---|---|
| 124 | Other Disorders of the Eye — with MCC | MDC 02 (Eye) | Medical |
| 125 | Other Disorders of the Eye — with CC | MDC 02 (Eye) | Medical |
| 126 | Other Disorders of the Eye — without CC/MCC | MDC 02 (Eye) | Medical |
MS-DRG Assignment Logic
When H31.401 serves as the principal diagnosis in a medical inpatient admission (no qualifying surgery performed), the grouper will assign MS-DRG 124, 125, or 126 based entirely on the presence and severity of secondary diagnoses (CC/MCC).CMS ICD-10-CM/PCS MS-DRG v37.0 Definitions Manual, cms.gov If a qualifying surgical procedure is performed (e.g., drainage of choroidal fluid via pars plana) and mapped to a valid ICD-10-PCS code, the case may group to a surgical MS-DRG within MDC 02 (e.g., MS-DRG 115/116 — Extraocular Procedures Except Orbit). Always verify current grouper logic with your facility’s GROUPER tool.
MCC/CC Impact Summary
| Scenario | Expected MS-DRG |
|---|---|
| H31.401 + documented MCC (e.g., sepsis, acute MI) | 124 |
| H31.401 + documented CC (e.g., HTN, DM without complications) | 125 |
| H31.401, no CC or MCC | 126 |
💊 Related CPT Codes, wRVU & Reimbursement
wRVU Note
Work RVUs listed below are approximate values based on the 2026 CMS Medicare Physician Fee Schedule (MPFS). Always verify against the current MPFS relative value file or your facility’s contract.AAPCAANEM
🔬 Diagnostic / Evaluation CPT Codes
| CPT Code | Description | wRVU | Global Period | Assistant Payable |
|---|---|---|---|---|
| 92004 | Ophthalmological exam, new patient, comprehensive, with dilation | 2.67 | 0 days | N/A |
| 92014 | Ophthalmological exam, established patient, comprehensive, with dilation | 1.34 | 0 days | N/A |
| 92134 | OCT — scanning computerized ophthalmic diagnostic imaging, posterior segment, with interpretation & report (unilateral or bilateral) | 0.00 (TC/PC split) | 0 days | N/A |
| 76512 | Ophthalmic ultrasound, diagnostic; B-scan (with or without non-quantitative A-scan) | 0.72 | 0 days | N/A |
🔧 Therapeutic / Surgical CPT Codes
| CPT Code | Description | wRVU | Global Period | Assistant Payable (Medicare) |
|---|---|---|---|---|
| 67015 | Aspiration or release of vitreous, subretinal, or choroidal fluid, pars plana approach (posterior sclerotomy) | ~6.47 | 90 days | ❌ Not payable (Indicator 2) |
| 67025 | Injection of vitreous substitute, pars plana or limbal approach (fluid-gas exchange), with or without aspiration | ~7.84 | 90 days | ❌ Not payable (Indicator 2) |
| 67036 | Vitrectomy, mechanical, pars plana approach | ~14.11 | 90 days | ❌ Not payable (Indicator 2) |
Assistant Payable — Important!
Medicare assigns CPT codes in the eye surgery family a Payment Indicator of “2” — meaning assistant-at-surgery services are NOT separately reimbursable by Medicare for most routine ophthalmic procedures, including 67015.Novitas Solutions Commercial payers may have different policies. Always verify payer-specific guidelines. If a -80 modifier is appended to an eye surgery claim submitted to Medicare and the code has indicator “2,” the claim will likely be denied or downcoded for that line.
🔖 Commonly Used Modifiers
| Modifier | Description | Use With H31.401 |
|---|---|---|
| -RT | Right side / right eye | ✅ Append to CPT codes when treating right eye |
| -LT | Left side / left eye | Use if treating the left eye instead |
| -50 | Bilateral procedure | Use if procedure performed on both eyes at same session |
| -79 | Unrelated procedure or service by same physician during postoperative period | Use if treating choroidal detachment during global of unrelated prior surgery |
| -78 | Unrelated return to OR during postoperative period | If patient returns for related complication procedure |
| -80 | Assistant surgeon (physician) | ❌ Generally not payable for Medicare eye surgery CPTs |
| -AS | Assistant at surgery — non-physician (PA, NP, RNFA) | ❌ Same restriction applies for Medicare |
| -51 | Multiple procedures | Append to secondary procedure when billing 67015 alongside another surgery |
📋 Coding Guidelines & Documentation Tips
Always Query for Specificity First
Before assigning H31.401, review the full chart — including operative reports, B-scan ultrasound reports, OCT reports, and clinic notes — for documentation of whether the detachment is hemorrhagic or serous. If the provider uses terms like “exudative,” “effusion,” or “fluid” → consider serous (H31.421). If terms like “blood,” “bleeding,” or “hemorrhage” are used → consider hemorrhagic (H31.411). Unspecified should be a last resort.
- Laterality is mandatory in ICD-10-CM. Never leave laterality unspecified if the record documents a specific eye. H31.409 (unspecified eye) is only appropriate when documentation truly does not specify laterality.
- If the choroidal detachment is documented as a postoperative complication, consider whether a complication code (e.g., from the H59.- category — Intraoperative and postprocedural complications of the eye) should be sequenced first, with H31.401 as an additional code.
- POA (Present on Admission): Required on inpatient claims. If the choroidal detachment was present at the time of admission, assign POA = Y. If it developed during the admission (e.g., post-surgical hypotony after intraocular surgery performed during that admission), assign POA = N.
- Code sequencing: In the inpatient profee setting, the code for the condition chiefly responsible for the admission goes first (principal diagnosis). If the patient was admitted specifically for choroidal detachment management, H31.401 would be the principal dx.
- When coding a surgical case for pars plana aspiration of choroidal fluid, remember that 67015 has a 90-day global period — any related E/M services or follow-up visits during the global window are generally bundled and not separately billable unless a significant, separately identifiable service is performed and appropriately modified (e.g., -25 on the E/M).Retinal Physician
- NCCI Edits: CPT 67015 is bundled with 67028 (intravitreal injection) — do not report both on the same day for the same eye without valid medical necessity documentation and an appropriate modifier.Retinal
💡 Coding Examples
Example 1 — Outpatient Office Visit, New Patient, Right Eye, No Surgery
Scenario: A 72-year-old Medicare patient presents as a new patient to a retina specialist with complaints of blurry vision and visual field loss in the right eye. The ophthalmologist performs a comprehensive ophthalmological exam with dilation. B-scan ultrasound is performed and interpreted. Findings reveal a choroidal detachment of the right eye; the type (hemorrhagic vs. serous) is not documented in the chart.
CPT: 92004--RT CPT: 76512--RT ICD-10-CM: H31.401
Example 2 — Surgical Case, Pars Plana Aspiration of Choroidal Fluid, Right Eye
Scenario: An established 68-year-old patient, 2 weeks post-trabeculectomy, presents with persistent right eye choroidal detachment unresponsive to conservative therapy. The vitreoretinal surgeon performs aspiration and release of choroidal fluid via the pars plana approach (posterior sclerotomy) on the right eye. The operative report documents “choroidal detachment” without specifying hemorrhagic or serous.
CPT: 67015-RT ICD-10-CM (Primary): H31.401
Global Note
Example 3 — Inpatient Admission, Medical Management, with CC
Scenario: A 79-year-old inpatient with type 2 diabetes (no complications) and essential hypertension is admitted for management of a right eye choroidal detachment. No surgical intervention is performed. The chart does not specify serous or hemorrhagic.
Principal Dx: H31.401 Secondary Dx: E11.9, I10 (CC-level diagnoses) MS-DRG Assignment: 125 — Other Disorders of the Eye, with CC POA: Y (for all diagnoses documented as present at admission)
Example 4 — Bilateral Choroidal Detachment, Both Eyes Documented
Scenario: Post-operative patient with bilateral choroidal detachments following bilateral cataract extraction. Both eyes are documented. Type not specified.
ICD-10-CM: H31.403 ← Use this code, NOT H31.401 alone CPT (if bilateral aspiration same session): 67015-50
🗂️ Differential Diagnosis Coding
| Condition | ICD-10-CM Code | Notes |
|---|---|---|
| Hemorrhagic choroidal detachment, right eye | H31.411 | Use when hemorrhagic type is documented |
| Serous choroidal detachment, right eye | H31.421 | Use when serous/exudative type is documented |
| Retinal detachment with break, right eye | H33.001 | Completely distinct from choroidal detachment |
| Unspecified choroidal hemorrhage, right eye | H31.301 | Hemorrhage without frank detachment |
| Expulsive choroidal hemorrhage, right eye | H31.311 | Severe hemorrhage driving choroid forward; rare |
| Uveal effusion syndrome | H44.811 | Idiopathic choroidal/ciliary body effusion |
Sources: AAPC Codify ICD-10-CM Code H31.401 — aapc.com | FindACode ICD-10-CM H31 Group — findacode.com | CMS ICD-10-CM/PCS MS-DRG v37.0 Definitions Manual — cms.gov | GenHealth.ai CPT 67015 — genhealth.ai | Retinal Physician Coding Corner — retinalphysician.com | Eyewiki: Managing Choroidal Effusions After Glaucoma Surgery — eyewiki.org | NCBI/PMC: Bilateral Choroidal Detachment PMC9944210 — pmc.ncbi.nlm.nih.gov | BCA: HCC Updates CY2026 — bcarev.com | MedPAC: MA CY2027 Comment Letter — medpac.gov | Novitas Solutions: Assistant at Surgery Fact Sheet — novitas-solutions.com | AAPC RVU Calculator — aapc.com | AANEM 2025-2026 RVU Comparison — aanem.org | CMS FY2026 ICD-10-CM Coding Guidelines — cms.gov