Crystal's MCW Coder Hub🧬ICD-10 CM H33.101 — Unspecified Retinoschisis, Right Eye
Quick Reference
Code: H33.101 | Billable: Yes | Chapter: 7 — Eye and Adnexa | HCC: No | Laterality: Right eye | Type: Unspecified (degenerative vs. juvenile not documented)
Description
ICD-10 CM H33.101 identifies retinoschisis of the right eye where the specific type has not been further documented. Retinoschisis is a splitting of the retinal layers within the neurosensory retina itself — distinct from retinal detachment, in which the neurosensory retina separates from the RPE, and distinct from serous RPE detachment (H35.721), in which fluid accumulates beneath the RPE. In retinoschisis, the retina splits along the plane of the outer plexiform layer (degenerative type) or the nerve fiber layer (juvenile X-linked type), creating a fluid-filled intraretinal cavity between inner and outer retinal leaves.
Retinoschisis vs. Retinal Detachment — Critical Distinction
Feature Retinoschisis (H33.101) Rhegmatogenous RD (H33.0-) Layer involved Intraretinal split (within neurosensory retina) Full neurosensory retina separates from RPE Breaks Absent or rare (outer leaf breaks rare) Present — defines rhegmatogenous RD Progression Slow; often stationary Rapid; surgical emergency Visual field loss Absolute scotoma in affected area Progressive field loss, may involve macula OCT appearance Intraretinal splitting with columnar bridges Subretinal fluid; retina elevated from RPE FA No leakage (unless secondary change) May show subretinal fluid pooling Urgency Elective monitoring; surgery if progresses Surgical emergency ICD-10 H33.101 H33.001-H33.051 Retinoschisis with an outer leaf break that progresses to a true retinal detachment is coded to the appropriate H33.0x code — the detachment supersedes the schisis code when both are present and a true rhegmatogenous detachment has occurred.
Code Structure & Hierarchy
Code Tree
- Chapter: 7 — Diseases of the Eye and Adnexa (H00-H59)
- Block: H30-H36 — Disorders of Choroid and Retina
- H33 — Retinal detachments and breaks ← this category
H33.101 vs. H33.191 — Unspecified vs. Other Retinoschisis
Code Use When H33.101 Type of retinoschisis is not documented (NOS) H33.191 A specific type is documented that does not fit degenerative or juvenile X-linked classification — e.g., acquired retinoschisis secondary to traction, retinitis pigmentosa-associated, or Goldman-Favre syndrome When the provider documents “degenerative retinoschisis” or “senile retinoschisis,” H33.101 is the appropriate unspecified code — ICD-10-CM does not have a separate code for degenerative vs. juvenile retinoschisis under H33.10x; both default here when not otherwise specified. Use H33.191 only when the provider documents a distinct secondary or atypical type.
Instructional Notes
Excludes1 — Mutually Exclusive
Cannot be coded together with H33.101:
- Rhegmatogenous retinal detachment (H33.0-) — when retinoschisis progresses to a true retinal detachment via an outer leaf break, code the detachment; do not code H33.101 simultaneously for the same eye
- Serous retinal detachment (H33.21) — serous RD is a distinct condition involving separation of the neurosensory retina from the RPE by serous fluid; not the same as intraretinal schisis
Excludes2 — Not Included Here, May Co-exist
The following may be coded in addition to H33.101 when separately documented:
- Cyst of ora serrata, right eye (H33.111) — peripheral retinal cysts may coexist with peripheral retinoschisis; both are separately reportable when confirmed
- Horseshoe tear without detachment (H33.311) — if a retinal break is found adjacent to but distinct from the schisis cavity, code separately; represents increased risk of progression to true RD
- Round hole without detachment (H33.321) — outer leaf break of retinoschisis without full detachment; separately reportable; may require prophylactic treatment
- Serous RPE detachment (H35.721) — may coexist as a separate macular finding
- Epiretinal membrane (H35.371) — may coexist as a separate finding
Use Additional Code
When retinoschisis is secondary to an identified underlying condition:
- Degenerative myopia → H44.2A1 — Degenerative myopia, right eye (myopic tractional retinoschisis is increasingly recognized as a distinct entity)
- Retinitis pigmentosa → H35.521 — Pigmentary retinal dystrophy, right eye
- Goldman-Favre disease / enhanced S-cone syndrome → H35.521 or applicable dystrophy code
- Juvenile X-linked retinoschisis → Q14.1 — Congenital malformation of retina (when confirmed in pediatric patients)
Clinical Description
Retinoschisis represents a pathological intraretinal splitting — a separation occurring within the layers of the neurosensory retina, most commonly at the level of the outer plexiform layer (degenerative/acquired type) or the nerve fiber layer (juvenile X-linked type). Unlike rhegmatogenous retinal detachment, the RPE remains attached and the outer retinal layers maintain metabolic contact with the choroid in most cases, which explains the slower progression and generally better visual prognosis compared to retinal detachment.
Two major types — both map to H33.101 when type is unspecified:
Degenerative (Acquired) Retinoschisis:
- Most common type — occurs in middle-aged to elderly patients; associated with aging, hyperopia, and peripheral retinal degeneration
- Typically involves the inferotemporal quadrant of the peripheral retina
- Splits at the outer plexiform layer; inner leaf (vitreal side) is thin and may be transparent; outer leaf contains photoreceptors and RPE
- Usually bilateral and symmetric, though may present unilaterally
- Slow progression; often asymptomatic; discovered incidentally on dilated fundus exam
- Classic appearance: smooth-domed elevation of the inner retinal leaf; may show “snowflakes” (white glial tuft remnants on the inner leaf surface) and “beaten metal” appearance
- Absolute scotoma in the schisis area (as opposed to relative scotoma in retinal detachment)
- Risk of progression to true retinal detachment if both inner and outer leaf breaks develop simultaneously (inner leaf break alone is common and typically benign)
Juvenile X-linked Retinoschisis (XLRS):
- Rare inherited condition; X-linked recessive; affects males almost exclusively; carriers (females) typically unaffected
- Caused by mutations in the RS1 gene encoding retinoschisin — a protein critical for retinal layer adhesion
- Splits at the nerve fiber layer
- Typically presents in the first decade of life with bilateral foveal schisis causing reduced visual acuity — foveal involvement is the hallmark distinguishing XLRS from degenerative retinoschisis
- OCT shows spoke-wheel pattern of intraretinal cysts at the fovea; ERG shows reduced b-wave amplitude with normal a-wave (electronegative ERG)
- May also involve peripheral schisis in addition to foveal involvement
- Code Q14.1 (congenital malformation of retina) may be more appropriate for confirmed XLRS in pediatric patients — provider documentation and genetic confirmation drive code selection
Myopic Tractional Retinoschisis:
- Increasingly recognized as a distinct clinical entity in highly myopic eyes
- Caused by vitreoretinal traction, epiretinal membrane, or internal limiting membrane rigidity in the context of posterior staphyloma
- OCT shows intraretinal schisis involving the foveal or perifoveal region
- May progress to foveal detachment or macular hole if untreated
- Code H44.2A1 (degenerative myopia with choroidal neovascularization, right eye) or applicable H44.2- code separately when myopia is the underlying etiology
OCT characteristics of retinoschisis (right eye):
- Intraretinal hyporeflective cavities with thin columnar bridges (vertical tissue pillars) traversing the schisis space
- Outer retinal layers remain attached to the RPE — distinguishes from subretinal fluid in retinal detachment
- Foveal involvement shows spoke-wheel or petal-like cystic pattern (XLRS) or outer retinal splitting (myopic tractional type)
- No subretinal fluid in pure retinoschisis unless outer leaf break has occurred
Coding Guidelines
Official Guideline Reference
ICD-10-CM Official Guidelines FY2025, Section I.C.7 — Diseases of the Eye and Adnexa
- Assign H33.101 when the provider documents retinoschisis of the right eye without further specification of type. If the provider documents a specific type (juvenile X-linked, degenerative, myopic tractional), use the most specific available code — H33.191 for “other” specified types, or Q14.1 for confirmed congenital/genetic forms in pediatric patients.
- Retinoschisis with an outer leaf break that has progressed to a true rhegmatogenous retinal detachment should be coded to the appropriate H33.0x code — the detachment supersedes H33.101 for that eye. Do not code both H33.101 and H33.0x for the same eye simultaneously when a true detachment is present.
- When retinoschisis is an incidental finding in a patient presenting for another primary ocular condition, H33.101 is coded as a secondary diagnosis if it is examined and documented in the provider’s assessment.
Sequencing Tips
- Outpatient — First-listed diagnosis: H33.101 when retinoschisis is the primary reason for the encounter (monitoring visit, new diagnosis, surgical evaluation)
- Secondary diagnosis: When retinoschisis is an incidental finding documented and managed alongside a primary condition (e.g., AMD, glaucoma), H33.101 is coded additionally
- Progression to RD: If schisis converts to detachment, retire H33.101 and assign the appropriate H33.0x code — document the transition clearly in the clinical note to support the code change
- POA (inpatient): Almost always Y — retinoschisis is a chronic slowly progressive condition present long before any inpatient admission. POA = N only if retinoschisis is a complication arising during the inpatient stay (extremely rare).
- Pediatric XLRS: In a male child presenting with bilateral foveal schisis and confirmed RS1 mutation, consider Q14.1 over H33.101 — coordinate with provider for genetic confirmation documentation
HCC Mapping
HCC Risk Adjustment
HCC Relevant: No HCC Model: CMS-HCC v28 HCC Category: Not mapped HCC Coefficient: 0.000 Risk Adjustment Impact: None
H33.101 carries no HCC weight under CMS-HCC v28. However, when retinoschisis is secondary to degenerative myopia (H44.2A1) or retinitis pigmentosa (H35.521), those underlying conditions may carry independent HCC or RAF significance and should always be coded separately when present.
Associated HCC Opportunities
While H33.101 has no HCC mapping, commonly coexisting conditions do — confirm and code separately:
- Degenerative myopia with CNV (H44.2A1) — maps to HCC 124 if CNV present
- Pigmentary retinal dystrophy / retinitis pigmentosa (H35.521) — no direct HCC but clinically significant; confirm with provider
- Exudative AMD (H35.3211) if coexisting — HCC 124
- Type 2 diabetes with retinopathy (E11.3511 etc.) — HCC 122
MS-DRG Mapping
DRG Assignment
MS-DRG Description MDC GMLOS 124 Other Disorders of the Eye with MCC MDC 2 4.6 125 Other Disorders of the Eye with CC or without CC/MCC MDC 2 3.1
CC/MCC Status
- CC status: No
- MCC status: No
- HAC designation: No
- POA exempt: No
- Inpatient note: Inpatient admission solely for retinoschisis is uncommon. Surgery for retinoschisis (vitrectomy for myopic tractional retinoschisis or complicated schisis-detachment) may occur inpatient when clinically indicated. In the inpatient setting, H33.101 most commonly appears as a secondary diagnosis. DRG is driven by the principal diagnosis and any CC/MCC secondary codes.
CPT Crosswalk
| CPT | Description |
|---|---|
| 92134 | OCT posterior segment, with interpretation and report |
| 92250 | Fundus photography with interpretation and report |
| 92225 | Ophthalmoscopy, extended, with retinal drawing, initial |
| 92226 | Ophthalmoscopy, extended, with retinal drawing, subsequent |
| 67028 | Intravitreal injection of pharmacologic agent (e.g., anti-VEGF for myopic CNV if concurrent) |
| 67036 | Vitrectomy, mechanical, pars plana approach |
| 67039 | Vitrectomy, pars plana; with focal endolaser photocoagulation |
| 67040 | Vitrectomy, pars plana; with endolaser panretinal photocoagulation |
| 67101 | Repair of retinal detachment; cryotherapy or diathermy, with or without drainage of subretinal fluid |
| 67105 | Repair of retinal detachment; photocoagulation, with or without drainage of subretinal fluid |
| 67107 | Repair of retinal detachment; scleral buckling (with or without encircling) |
| 67108 | Repair of retinal detachment; vitrectomy, any method, with or without air or gas tamponade, with or without drainage, with or without photocoagulation |
| 67113 | Repair of complex retinal detachment (e.g., proliferative vitreoretinopathy, detachment with multiple retinal breaks) |
| 67141 | Prophylaxis of retinal detachment; cryotherapy, diathermy |
| 67145 | Prophylaxis of retinal detachment; photocoagulation |
Prophylactic Treatment Coding for Retinoschisis
- 67141 or 67145 — used for prophylactic laser or cryotherapy applied to retinal breaks (outer leaf holes) associated with retinoschisis to reduce risk of progression to full retinal detachment
- These codes apply when treatment is rendered to prevent detachment — they do not imply a detachment has occurred
- Modifier -RT required for right eye procedures
- If schisis-associated detachment has already occurred, the repair codes (67107, 67108, 67113) replace prophylaxis codes and the diagnosis shifts to the appropriate H33.0x code
ICD-10-PCS Crosswalk
PCS Applicability
ICD-10-PCS applies in the inpatient setting only. Surgical procedures for retinoschisis in the inpatient setting may include vitrectomy (for myopic tractional retinoschisis or schisis-associated detachment) or scleral buckling.
| PCS Code | Root Operation | Body Part | Approach | Device | Qualifier |
|---|---|---|---|---|---|
| 08B33ZZ | Excision | Vitreous, Right | Percutaneous | No Device | No Qualifier |
| 08N33ZZ | Release | Vitreous, Right | Percutaneous | No Device | No Qualifier |
| 08T3XZZ | Resection | Vitreous, Right | External | No Device | No Qualifier |
Character breakdown — pars plana vitrectomy, right eye (08B33ZZ):
- Section: 0 — Medical and Surgical
- Body System: 8 — Eye
- Root Operation: B — Excision
- Body Part: 33 — Vitreous, Right
- Approach: 3 — Percutaneous
- Device: Z — No Device
- Qualifier: Z — No Qualifier
ICD-10-CM Crosswalk
| Code | Description | Relationship |
|---|---|---|
| H33.102 | Unspecified retinoschisis, left eye | Contralateral equivalent |
| H33.103 | Unspecified retinoschisis, bilateral | Bilateral equivalent |
| H33.109 | Unspecified retinoschisis, unspecified eye | Less specific — avoid if laterality documented |
| H33.191 | Other retinoschisis and retinal cysts, right eye | Use for specified secondary or atypical types |
| H33.111 | Cyst of ora serrata, right eye | May coexist — peripheral retinal cyst |
| H33.001 | Unspecified RD with retinal break, right eye | Progression endpoint — Excludes1 when present |
| H33.011 | RD with single break, right eye | Schisis-to-detachment progression — supersedes H33.101 |
| H33.311 | Horseshoe tear without detachment, right eye | Coexisting break — separately reportable; Excludes2 |
| H33.321 | Round hole, right eye | Outer leaf break — separately reportable; high-risk |
| H33.21 | Serous retinal detachment, right eye | Distinct condition — Excludes1 |
| H33.41 | Traction detachment, right eye | Advanced complication — supersedes H33.101 |
| H35.721 | Serous detachment of RPE, right eye | Distinct layer — may coexist as separate finding |
| H35.371 | Puckering of macula, right eye | ERM — may coexist in myopic tractional cases |
| H44.2A1 | Degenerative myopia with CNV, right eye | Secondary etiology — myopic tractional retinoschisis |
| H35.521 | Pigmentary retinal dystrophy, right eye | Secondary etiology — RP-associated retinoschisis |
| Q14.1 | Congenital malformation of retina | Juvenile X-linked RS — consider in confirmed pediatric cases |
Coding Examples
Example 1 — Incidental Peripheral Retinoschisis, Right Eye, Routine Dilated Exam, Outpatient
Scenario: A 67-year-old hyperopic patient presents for routine annual dilated fundus exam. Extended ophthalmoscopy reveals a smooth-domed peripheral elevation in the inferotemporal quadrant of the right eye with a beaten-metal appearance consistent with degenerative retinoschisis. OCT confirms intraretinal splitting without subretinal fluid. No breaks identified. Provider documents peripheral degenerative retinoschisis, right eye — observation only. Primary reason for visit is refraction and routine exam. First-listed Dx: Z01.01 — Encounter for examination of eyes and vision with abnormal findings Additional Dx: H33.101 — Unspecified retinoschisis, right eye (abnormal finding documented in assessment) CPT: 92225-RT — Extended ophthalmoscopy, initial; 92134 — OCT posterior segment Notes: H33.101 is an additional diagnosis here — the routine exam is first-listed. If the visit had been scheduled specifically for retinoschisis monitoring, H33.101 would be first-listed. No treatment rendered; observation is appropriate for peripheral degenerative retinoschisis without breaks.
Example 2 — Retinoschisis with Outer Leaf Break, Prophylactic Laser, Right Eye, Outpatient
Scenario: A 71-year-old patient with known right eye retinoschisis presents for follow-up. OCT and fundus exam reveal a new outer leaf break at the posterior margin of the schisis cavity without evidence of true subretinal fluid or full retinal detachment. Provider documents retinoschisis with outer leaf hole, right eye — prophylactic laser photocoagulation applied to surround the break. First-listed Dx: H33.101 — Unspecified retinoschisis, right eye (retinoschisis remains the primary diagnosis — no true detachment yet) Additional Dx: H33.321 — Round hole, right eye (the outer leaf break is a separately reportable finding — Excludes2 relationship allows dual coding) CPT: 67145-RT — Prophylaxis of retinal detachment, photocoagulation, right eye Notes: H33.101 remains appropriate — the outer leaf break has not yet produced a true rhegmatogenous detachment. If subretinal fluid is subsequently confirmed on OCT at a future visit, update to the appropriate H33.0x code and schedule repair. Document the rationale for prophylactic laser clearly to support medical necessity.
Example 3 — Myopic Tractional Retinoschisis, Right Eye, Vitrectomy Evaluation, Outpatient
Scenario: A 48-year-old with high myopia (axial length 28.2 mm right eye) presents with progressive metamorphopsia and reduced BCVA right eye. OCT demonstrates foveal retinoschisis with outer retinal layer involvement and early foveal detachment in the context of a posterior staphyloma. Provider documents myopic tractional retinoschisis, right eye — vitrectomy with ILM peel considered. First-listed Dx: H33.101 — Unspecified retinoschisis, right eye (myopic tractional retinoschisis — no separate ICD-10 code; H33.101 is correct; H33.191 also defensible if provider documents it as a distinct secondary type) Additional Dx: H44.2A1 — Degenerative myopia, right eye (underlying etiology — separately reportable) CPT: 92134 — OCT posterior segment; 92225-RT — Extended ophthalmoscopy, initial Notes: Myopic tractional retinoschisis is a growing clinical entity with distinct OCT features and management pathway. No separate ICD-10 code exists; H33.101 is appropriate with H44.2- as the secondary etiology code. If vitrectomy proceeds, 67036-RT or 67042-RT (with ILM peel) will be the operative CPT.
Coding Pitfalls & Tips
Common Errors
- Coding H33.101 when a true rhegmatogenous retinal detachment has already occurred — if both inner and outer leaf breaks are present and subretinal fluid is confirmed, retire H33.101 and code the appropriate H33.0x (e.g., H33.011 single break, H33.021 multiple breaks). The Excludes1 instruction is absolute.
- Using H33.109 (unspecified eye) when the right eye is clearly documented — always assign H33.101 with confirmed right eye laterality
- Confusing retinoschisis with serous retinal detachment (H33.21) — serous RD involves separation of the full neurosensory retina from the RPE by subretinal fluid; retinoschisis is an intraretinal split with the outer retinal layers remaining attached to the RPE. These are Excludes1 — mutually exclusive.
- Failing to separately code an outer leaf break (H33.321) when documented alongside retinoschisis — the break is a distinct finding that is separately reportable and clinically significant (increased risk of progression to detachment); the Excludes2 relationship permits dual coding
- Carrying H33.101 forward after progression to retinal detachment without updating the diagnosis code — this is one of the most common longitudinal coding errors in retina practices with patients monitored over many years
- Failing to code the underlying etiology (degenerative myopia H44.2A1, retinitis pigmentosa H35.521) when secondary retinoschisis is documented — the etiology carries independent clinical and occasionally HCC significance
Pro Tips
- OCT is essential for distinguishing retinoschisis from retinal detachment — the key differentiator is the presence of columnar tissue bridges within the schisis cavity (absent in subretinal fluid) and the status of the outer retinal layers (attached to RPE in retinoschisis, separated in RD). Document OCT findings in the provider note, not just the imaging report.
- The demarcation line test — retinoschisis produces an absolute scotoma (not relative) on visual field testing because both inner and outer retinal layers are present but separated; retinal detachment produces a relative scotoma initially. This functional distinction supports the diagnostic coding.
- For juvenile X-linked retinoschisis in pediatric males, the ERG (electronegative pattern — reduced b-wave with preserved a-wave) and RS1 genetic testing results should be documented — if confirmed, coordinate with the provider on whether Q14.1 (congenital malformation of retina) is more appropriate than H33.101 for the confirmed genetic diagnosis
- Myopic tractional retinoschisis involving the fovea carries a meaningfully different prognosis and surgical consideration than peripheral degenerative retinoschisis — document the involved region (peripheral vs. foveal/macular) in the provider note to distinguish the clinical scenarios, even though both currently map to H33.101
- When bilateral retinoschisis is found (common in degenerative type), use H33.103 — do not code H33.101 + H33.102 simultaneously
Key distinctions built in
- Retinoschisis vs. RD comparison table — the most critical distinction in retina coding; intraretinal split vs. full neurosensory retina separating from RPE. When an outer leaf break progresses to true subretinal fluid, H33.101 is retired and H33.0x takes over. That transition point is one of the most common longitudinal coding errors in retina practices.
- H33.101 vs. H33.191 — the “unspecified” vs. “other” decision is explained with a decision table. H33.191 is reserved for provider-documented specific secondary or atypical types; H33.101 covers degenerative, juvenile X-linked, and any other type when not further specified.
- Three clinical subtypes — degenerative, juvenile X-linked (XLRS), and myopic tractional — are fully described even though all three currently map to H33.101 when type is unspecified. The clinical documentation distinctions matter for surgical planning and medical necessity even when the ICD-10 code is the same.
- Q14.1 crosswalk for XLRS — flagged as a consideration for confirmed pediatric RS1 mutation cases. Not a definitive rule since coding depends entirely on provider documentation, but important for CDI awareness.
- Prophylactic laser coding — 67141/67145 are correctly positioned as the treatment CPTs when a break is found without true detachment, with clear language that these give way to repair codes (67107/67108/67113) if a true RD develops.
CDI Query Opportunities
CDI Flags
- Type specificity: Is the retinoschisis degenerative (acquired/senile), juvenile X-linked (RS1 mutation confirmed), or myopic tractional? Query the provider for documentation of type — while ICD-10-CM currently does not have separate codes for degenerative vs. juvenile under H33.10x, documentation of type supports clinical accuracy, medical necessity, and may affect code selection between H33.101 and H33.191 or Q14.1
- Breaks present? Does the fundus exam or OCT show any inner or outer leaf breaks associated with the schisis cavity? If outer leaf break is confirmed, H33.321 should be coded separately — query if break status is not documented in the assessment
- Detachment vs. schisis: Has subretinal fluid developed beneath the outer leaf? Is there a true retinal detachment? OCT and exam findings should clarify — if detachment is present, query the provider to confirm and update to H33.0x
- Myopic etiology: Is high myopia (H44.2-) documented as the underlying cause? Query for explicit linkage between the myopia and the tractional retinoschisis — allows additional etiology coding
- Bilateral involvement: Is the fellow left eye also affected? Degenerative retinoschisis is frequently bilateral — query for bilateral documentation → H33.103
- Foveal involvement: Is the macula or fovea involved on OCT? Foveal schisis carries different visual prognosis and surgical urgency — document explicitly to support management decisions and medical necessity for surgical intervention
- Genetic testing: In a young male patient — has RS1 genetic testing been performed? If positive, confirm whether the provider will document juvenile X-linked retinoschisis as the diagnosis, which may influence code selection toward Q14.1
Related Codes
- Laterality family: H33.102, H33.103, H33.109
- Other specified retinoschisis: H33.191, H33.192, H33.193
- Retinal cysts: H33.111, H33.121
- Progression endpoint — RD: H33.001, H33.011, H33.021, H33.031, H33.041, H33.051
- Coexisting breaks: H33.311, H33.321, H33.331
- Traction detachment: H33.41
- Secondary etiologies: H44.2A1, H35.521, Q14.1
- Associated macular findings: H35.371, H35.721, H35.341
- CPT crosswalk: 67036, 67039, 67141, 67145, 67107, 67108, 92134, 92225, 92226
- PCS crosswalk: 08B33ZZ, 08N33ZZ
Sources
ICD-10-CM Official Guidelines for Coding and Reporting FY2025. CMS/NCHS. ICD-10-CM Tabular List of Diseases and Injuries FY2025. CMS. CMS MS-DRG Definitions Manual v42. Centers for Medicare & Medicaid Services. CMS-HCC Risk Adjustment Model v28 Coefficients and Category Mappings. CMS, 2024. AHA Coding Clinic for ICD-10-CM/PCS. American Hospital Association. AAO Coding Coach — Ophthalmology CPT and ICD-10 Reference 2025. American Academy of Ophthalmology. Lincoff H, Kreissig I. Retinoschisis: classification and management. Survey of Ophthalmology. 1999. Spaide RF, et al. Myopic tractional maculopathy. Retina. 2020. Levin AV, et al. X-linked juvenile retinoschisis. GeneReviews. National Library of Medicine. 2023. CMS NCCI Policy Manual FY2025, Chapter 9 — Eye and Ocular Adnexa.