CPT code 65222 – Corneal foreign body removal with slit lamp

Key takeaways

CPT code 65222 covers corneal foreign body removal with a slit lamp. Use 65220 when no slit lamp is used.

Coding is per eye, not per foreign body, so bill once per eye per encounter however many fragments come out.

Medicare and most commercial payers require the RT or LT laterality modifier, and a missing one is the top denial trigger for this code.

The code carries a 0-day global period, so a same-day E/M needs modifier 25 and follow-up visits on later dates are billable.

CPT code 65222: Quick reference table

CPT code 65222 is billed when a foreign body is removed from the cornea under slit lamp magnification. It is coded once per eye and carries a 0-day global period. Use this table to confirm the code before you build the claim.

What CPT code 65222 covers: Procedure scope and clinical criteria

CPT code 65222 covers the removal of a foreign body lodged in the corneal epithelium or stroma under slit lamp magnification. It differs from simple irrigation or conjunctival removal in two ways. The corneal surface is examined under biomicroscopic visualization, and the embedded material is mechanically dislodged.

The AMA CPT code set separates the 652xx family by anatomic location (conjunctiva, cornea or intraocular) and by instrument (with or without a slit lamp). Both must be documented to support 65222.

What constitutes a billable 65222 encounter:

• Slit lamp examination of the cornea to localize the foreign body
• Mechanical removal using a needle, spud, jeweler’s forceps, or ophthalmic burr
• Rust ring removal, if present (see global period section for rebilling rules)
• Documentation of the instrument used and the anatomic site in the procedure note

Simple saline irrigation that dislodges a superficial particle without slit lamp use does not support 65222. The American Academy of Ophthalmology codes this as 65220 or, if conjunctival, 65205. Scraping away damaged corneal epithelium with no foreign body present is a separate service, billed as 65435.

How the procedure is performed and what the note must include

Inadequate documentation is the most avoidable reason 65222 claims are downcoded to 65220. The procedure note does not need to be long, but it must hit specific elements that payers look for during post-payment review.

Typical procedure steps and their corresponding documentation requirements:

1. Slit lamp examination: Note that the slit lamp was used, including the magnification setting if your practice captures it. This is the make-or-break documentation element for 65222 versus 65220.
2. Topical anesthesia: Document the agent applied (e.g. proparacaine 0.5%) and laterality.
3. Foreign body description: Note the material if known (metallic fragment, wood, glass) and the quadrant. Record whether it sat in the superficial epithelium or was embedded in the stroma.
4. Removal technique: State the instrument used. A 25-gauge needle, ophthalmic spud, or Alger brush are all acceptable; document whichever you used.
5. Rust ring: If a rust ring was present, note whether it was removed in the same session or deferred. Payer rules on separate billing vary (see global period section).
6. Post-procedure status: Record the corneal defect size (in millimeters), fluorescein staining result, and the eye patch or antibiotic drop regimen prescribed.

A note that says only “foreign body removed from right eye” does not specify the anatomic location or instrument. That is enough for a denial or a downcode to 65205. Write the slit lamp into the note every time.

CPT 65222 vs 65220, 65205, 65210: Choosing the right code

65222 sits in the eye and ocular adnexa range of the CPT procedure codes. Its 652xx foreign body family branches on anatomy first, then on instrument or depth. This table maps the full family.

Decision shortcut: If the foreign body is in the conjunctiva, start at 65205 or 65210. If it is in the cornea, the question is simply whether a slit lamp was used. Yes = 65222. No = 65220.

Intraocular foreign bodies route to 65235, 65260 or 65265 and belong in a surgical facility, not an office encounter. The diagram below walks through the same two questions.

Modifiers for CPT code 65222

Four modifiers apply regularly to 65222 claims. Using the wrong one, or omitting a required one, accounts for a significant share of denials on this code.

On modifier 25: 65222 is a minor procedure with a 0-day global. The same-day evaluation that leads to the removal is bundled into the procedure payment.

A same-day E/M is billable with modifier 25 only when it is significant and separately identifiable beyond the usual pre-procedure assessment. That applies to new and established patients alike. An example is reviewing diabetic eye disease while also removing the foreign body. Document the E/M separately, and do not add modifier 25 simply because a brief exam preceded the procedure.

Medicare reimbursement and RVUs for CPT code 65222

Medicare pays for CPT code 65222 based on the Relative Value Units (RVUs) assigned to the code. Those RVUs are multiplied by the annual conversion factor and adjusted by a geographic practice cost index (GPCI) for each Medicare Administrative Contractor (MAC) locality. The CMS Medicare Physician Fee Schedule look-up tool returns the exact national and locality-adjusted rates for any year.

National non-facility rates are higher than facility rates. The practice expense component changes when the service moves from an office to an ambulatory surgery center or hospital outpatient department. For a minor procedure like 65222 performed in an ophthalmology office, the non-facility rate applies in most cases.

For current RVU components, use the FastRVU 2026 RVU look-up tool, which mirrors CMS data and allows locality filtering. Private-payer rates vary by contract, so check the fee schedule you agreed with each payer.

Global period, follow-up visits, and bundling rules

CPT code 65222 carries a 0-day global period. The CMS Medicare Physician Fee Schedule lists it with global indicator 000, the same as 65205, 65210, and 65220. That makes it a minor procedure: the global package covers the date of service only, with no post-operative window after it.

What is included in the payment for 65222:

• The same-day evaluation and the decision to remove the foreign body
• Topical anesthesia, the removal itself, and any rust ring removal done in the same session
• Immediate post-procedure care on the date of service, such as fluorescein staining and patching

What can be billed separately:

• A same-day E/M with modifier 25, but only when it is significant and separately identifiable beyond the usual pre-procedure assessment. Document it separately in the note.
• Follow-up visits on later dates, such as a patch removal or a recheck of the epithelial defect. They fall outside the 0-day global, so bill them as E/M services supported by medical necessity, with no modifier 24.
• Deferred rust ring removal at a later visit, subject to payer policy (see below).

Rust ring billing is the most variable area for this code. The AAO guidance indicates that rust ring removal is generally considered part of the original foreign body removal when it happens in the same session. When the clinician defers it to a later visit, some payers accept a separate 65222 on that date, while others bundle it.

Because the global period is 0 days, that later visit needs no global-period modifier such as 58 or 79. Use the subsequent-encounter diagnosis (T15.01XD or T15.02XD), document why removal was deferred, and confirm the policy with your payer before submitting.

Payer requirements and prior authorization

Most payers do not require prior authorization for CPT code 65222 because corneal foreign body removal is an urgent procedure. Requiring pre-approval for a patient presenting with acute eye pain and a metallic fragment in the cornea is not consistent with medical necessity standards.

That said, documentation of acuity matters. The procedure note should reflect the urgent nature of the visit: patient-reported onset, occupational exposure history, and the clinical urgency that required same-day intervention. This protects the claim in a medical necessity review.

Place of service (POS) code also affects payment. Most 65222 claims use POS 11 (office).

If the procedure takes place in an emergency room or ambulatory surgery center, use that site’s POS code. Expect a lower physician payment there, because the facility overhead is paid separately. A POS that doesn’t match where the service took place overstates the payment, which makes it a compliance problem for the practice.

Common denial reasons for CPT code 65222 and how to fix them

Claims for corneal foreign body removal with slit lamp are denied for predictable reasons. Building a denial checklist into the pre-submission workflow catches most of them before the claim leaves the practice. Systematic denial management workflows reduce resubmission lag and protect cash flow.

Running a clean claim submission checklist against 65222 encounters before batch submission catches laterality errors and missing modifiers before they generate a denial cycle.

ICD-10 diagnosis codes to pair with CPT code 65222

Pairing the correct ICD-10 code with 65222 is essential for medical necessity and laterality alignment. The T15 category covers foreign body on the external eye. Use the most specific code available, which means coding laterality (right or left) rather than defaulting to unspecified.

The laterality character in ICD-10-CM T15 codes is the fifth character: 0 = unspecified eye, 1 = right, 2 = left. The sixth is the placeholder X, and the seventh is the encounter character.

Always document the affected eye in the clinical note so the laterality codes can be assigned correctly. Payers that cross-check the ICD-10 laterality against the CPT modifier (RT/LT) will deny claims where these do not agree.

Billing CPT code 65222 in practice management software

A clean medical billing workflow for 65222 runs through five linked steps. Each is easy to get right when the system enforces it, and easy to miss when it doesn’t.

Steps for a clean 65222 claim in an EHR or practice management system:

1. Select procedure code 65222 from the procedure library, not a free-text entry. A structured code selection reduces transcription errors.
2. Attach the laterality modifier (RT or LT) at the line level. Do not rely on a global modifier setting; line-level modifiers give you flexibility for bilateral encounters.
3. Link the correct ICD-10 diagnosis. Use T15.01XA for the right eye or T15.02XA for the left eye. If the system supports diagnosis-to-procedure linking, confirm the laterality characters match across both codes.
4. Set the place of service to match where the procedure took place. Use POS 11 for an office, POS 22 for hospital outpatient, and POS 23 for an emergency room. The fee schedule the system applies should adjust automatically based on the POS selection.
5. Run pre-submission edits. Most clearinghouses and practice management systems flag missing modifiers, mismatched laterality, and bundling conflicts before transmission.

Pabau, the practice management platform we build, runs these checks in its eye care claims software. It flags the modifier and ICD-10 laterality mismatches behind most 65222 denials before the claim goes out.

Claims go out through Pabau’s Claim.MD integration, which connects practices to more than 4,000 US payers. It covers CMS-1500 and 837P submission, real-time eligibility verification, and ERA posting.

The outcome is fewer 65222 claims coming back for rework. Your billing team stops chasing laterality and modifier errors and spends that time on new encounters instead.

Reduce 65222 claim denials with built-in coding checks

Pabau’s claims management flags missing modifiers, laterality mismatches, and ICD-10 errors before claims leave the practice. Your billing team spends its time on new encounters instead of rework.

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Conclusion

65222 claims fail on two points above all others. The slit lamp is missing from the procedure note, or the RT or LT modifier is missing from the claim.

Neither fix needs a policy change or extra staff. Add a note template that prompts for slit lamp use, and a scrub rule that holds any 652xx claim without RT or LT. With both in place, the two most common causes of rework on this code are caught before submission.

Pabau runs those checks automatically and sends claims through Claim.MD with laterality-matched ICD-10 codes. Book a demo to see how it keeps 65222 claims clean from procedure note to payment.

Continue your research

Want these claim checks built into your billing? Claims management software covers the end-to-end billing workflow, from code selection through ERA posting.

Unsure how clearinghouse submission works? Medical claims clearinghouse guide explains how 837P files reach payers and how ERAs come back.

Want to understand the 837 file format behind electronic claims? 837 file overview covers the transaction set used for CMS-1500 and professional claims.

Removing corneal epithelium rather than a foreign body? CPT code 65435 covers corneal epithelium removal, with or without chemocauterization.

Billing the eye exam for a new patient? CPT code 92002 covers the intermediate ophthalmological exam for a new patient.

Frequently asked questions