TL;DR: The Centers for Medicare & Medicaid Services modified NCD 213 governing endothelial cell photography coverage, effective March 7, 2026. Here's what billing teams need to know.
CMS endothelial cell photography coverage policy under NCD 213 defines exactly when Medicare pays for specular microscopy used before ocular surgery. The policy does not list specific CPT or HCPCS codes in its current revision — but the medical necessity criteria are detailed, and claim denials hinge on whether your documentation maps cleanly to one of seven covered indications. If your practice bills for pre-surgical eye exams or ophthalmic procedures, this policy directly affects your reimbursement.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Endothelial Cell Photography — NCD 213 |
| Policy Code | NCD 213 |
| Change Type | Modified |
| Effective Date | 2026-03-07 |
| Impact Level | Medium |
| Specialties Affected | Ophthalmology, Ocular Surgery |
| Key Action | Audit pre-surgical documentation to confirm it maps to at least one covered indication before billing endothelial cell photography |
CMS Endothelial Cell Photography Coverage Criteria and Medical Necessity Requirements 2026
NCD 213 is the National Coverage Determination governing Medicare coverage of endothelial cell photography. The procedure uses a specular microscope to count corneal endothelial cells. Ophthalmologists use it to predict whether a patient's cornea will tolerate ocular surgery.
Under the updated CMS endothelial cell photography coverage policy, Medicare covers this procedure when it is "reasonable and necessary" — the standard medical necessity threshold — and the patient meets at least one of seven criteria. Meeting that threshold requires clinical documentation. Chart notes that simply say "pre-op workup" won't hold up on audit.
Here are the seven covered indications, directly from NCD 213:
| # | Covered Indication |
|---|---|
| 1 | Slit lamp evidence of endothelial dystrophy (cornea guttata) |
| 2 | Slit lamp evidence of corneal edema — unilateral or bilateral |
| 3 | The patient is about to undergo a secondary intraocular lens implantation |
| 4 | The patient has had previous intraocular surgery and now needs cataract surgery |
| 5 | The patient is about to undergo a surgical procedure with higher risk to the corneal endothelium — specifically phacoemulsification or refractive surgery (excluding procedures listed under §80.7) |
| 6 | Evidence of posterior polymorphous dystrophy of the cornea or irido-corneal-endothelium (ICE) syndrome |
| 7 | The patient is about to be fitted with extended wear contact lenses after intraocular surgery |
Every single one of those criteria requires documented clinical evidence. "About to undergo" means you need a scheduled procedure on record. "Slit lamp evidence" means the slit lamp findings are in the chart — not just a clinical impression.
One more thing on medical necessity: prior authorization is not explicitly required by NCD 213 for endothelial cell photography. But that does not mean your Medicare Administrative Contractor won't apply local coverage determination rules on top of this NCD. Check with your MAC before assuming the NCD is your only hurdle.
The Cataract Surgery Bundling Rule
This is the part of the coverage policy most billing teams get wrong. CMS is explicit: when the only visual problem is cataracts and the pre-surgical exam conditions under NCD 213 are met, endothelial cell photography is covered as part of the pre-surgical comprehensive eye exam — not in addition to it.
Read that again. You cannot bill endothelial cell photography as a separate line item on top of a comprehensive or combination brief/intermediate eye exam when the sole diagnosis is cataracts. It's bundled. Billing it separately will produce a claim denial.
The cross-reference in the policy points to §10.1. That section covers the pre-surgical eye examination reimbursement rules for cataract surgery. Your billing team should be familiar with both sections — they work together.
CMS Endothelial Cell Photography Exclusions and Non-Covered Indications
NCD 213 does not frame its exclusions as a separate list, but the boundaries are clear from the coverage criteria.
Refractive procedures are the main exclusion zone. The policy covers endothelial cell photography before refractive surgery but then immediately carves out excluded refractive procedures under §80.7. If a patient is undergoing a procedure on the §80.7 exclusion list, endothelial cell photography is not covered — even if the procedure technically involves risk to the corneal endothelium.
Routine pre-operative workups without any of the seven indications are also not covered. If a patient is having a straightforward first cataract surgery with no previous intraocular surgery, no corneal edema, no dystrophy, and no extended wear contact lens fitting — endothelial cell photography does not meet medical necessity under this policy.
Coverage Indications at a Glance
| Indication | Status | Notes |
|---|---|---|
| Slit lamp evidence of cornea guttata (endothelial dystrophy) | Covered | Slit lamp findings must be documented in the chart |
| Slit lamp evidence of corneal edema (unilateral or bilateral) | Covered | Document laterality; both qualify |
| About to undergo secondary intraocular lens implantation | Covered | Scheduled procedure must be on record |
| Previous intraocular surgery + needs cataract surgery | Covered | Prior surgical history must be documented |
| About to undergo phacoemulsification or qualifying refractive surgery | Covered | Excludes refractive procedures listed in §80.7 |
| Evidence of posterior polymorphous dystrophy or ICE syndrome | Covered | Clinical evidence required, not just diagnosis code |
| About to be fitted with extended wear contact lenses post-intraocular surgery | Covered | Surgery must be prior; fitting must be upcoming |
| Cataract surgery pre-op when only problem is cataracts | Covered (bundled only) | Covered as part of comprehensive pre-surgical eye exam — not separately billable |
| Refractive procedures excluded under §80.7 | Not Covered | Exclusion applies even if corneal endothelium risk is present |
| Routine pre-op without any covered indication | Not Covered | No indication = no medical necessity under NCD 213 |
CMS Endothelial Cell Photography Billing Guidelines and Action Items 2026
This is where the policy update requires real work from your billing team. Follow these steps before the effective date of March 7, 2026.
| # | Action Item |
|---|---|
| 1 | Audit your pre-surgical documentation templates. Every order for endothelial cell photography should automatically prompt the documenting provider to record which of the seven NCD 213 indications applies. If your templates don't prompt for this, update them now. Vague chart notes are the number one driver of claim denial on this procedure. |
| 2 | Identify all cataract pre-op billing workflows and enforce the bundling rule. Pull claims from the last 90 days where endothelial cell photography was billed alongside a comprehensive pre-surgical eye exam with a primary cataract diagnosis. If you see separate line items when the only condition is cataracts, you have a billing problem. Correct it before March 7, 2026. |
| 3 | Cross-check your refractive surgery cases against the §80.7 exclusion list. Endothelial cell photography is covered before some refractive surgeries but not all. Get the §80.7 exclusion list in front of your clinical team. When a case involves a refractive procedure, the billing team needs to know whether it's on that list before the claim goes out. |
| 4 | Confirm with your MAC whether a local coverage determination applies. NCD 213 sets the floor, but your Medicare Administrative Contractor may have an LCD that adds conditions, documentation requirements, or coding rules. Call your MAC contractor or check their website. Don't assume the NCD is the complete picture. |
| 5 | Review your prior authorization workflows for ophthalmic procedures. NCD 213 does not require prior authorization for endothelial cell photography itself. But if your practice bills phacoemulsification or secondary lens implantation — the higher-risk procedures that trigger coverage — check whether your MAC or any commercial plan running alongside Medicare requires prior auth for the primary procedure. The documentation you pull for prior auth will also support your NCD 213 medical necessity defense. |
| 6 | Train your coders on the seven covered indications. Endothelial cell photography billing denials usually come down to documentation, not coding. But coders who understand the indications will catch under-documented cases before they go out the door. A 30-minute training now is cheaper than working appeals later. |
If you're not sure how your specific patient mix maps to these indications, loop in your compliance officer before March 7, 2026. The bundling rule in particular creates real exposure if your practice routinely bills pre-surgical eye exams and cataract surgery.
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Endothelial Cell Photography Under NCD 213
Covered CPT Codes (When Selection Criteria Are Met)
The current version of NCD 213 does not list specific CPT or HCPCS codes. CMS has not enumerated covered procedure codes within this NCD revision.
This is genuinely inconvenient for billing teams. It means you cannot build a simple code-to-policy map and call it done. Instead, endothelial cell photography billing relies on documentation matching the seven covered indications — and your coders need to know which CPT code in their charge master corresponds to specular microscopy at your practice.
Talk to your billing consultant or check your MAC's fee schedule and any associated LCD for the specific CPT code your region expects for specular microscopy / endothelial cell photography. Do not assume a code is covered just because the procedure is covered.
Key ICD-10-CM Diagnosis Codes
NCD 213 does not enumerate ICD-10-CM codes. However, the covered indications map directly to diagnosable conditions. Your coding team should ensure diagnosis codes reflect the specific indication — not a generic pre-op code. Conditions like cornea guttata, corneal edema, posterior polymorphous dystrophy, and ICE syndrome each have specific ICD-10-CM codes. Use them. A generic "pre-operative examination" diagnosis without the underlying condition will not support medical necessity under this policy.
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