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Medical coding is the translation of clinical documentation into standardized codes used for billing. Understanding coding fundamentals is essential for the CPO (Certified Paraoptometric) certification exam, as front office and billing staff must accurately record services, assign diagnoses, and support clean claim submission. Coding errors directly affect practice revenue, audit risk, and compliance.
| CPT Code | Description | When Used |
|---|---|---|
| 92002 | Ophthalmological service; new patient, intermediate | New patient, not full comprehensive exam |
| 92004 | Ophthalmological service; new patient, comprehensive | New patient, full comprehensive including dilation and refraction |
| 92012 | Ophthalmological service; established patient, intermediate | Established patient, problem-focused or not all comprehensive elements |
| 92014 | Ophthalmological service; established patient, comprehensive | Established patient, all comprehensive elements performed |
| 92015 | Determination of refractive state (refraction) | Separate charge for refraction when billed separately |
| 92310 | Contact lens prescription; corneal lens, both eyes | Contact lens fitting and prescription for both eyes |
| 92083 | Visual field examination, unilateral/bilateral (extended) | Automated threshold visual field testing |
| 76514 | Ophthalmic ultrasound, echography, diagnostic; corneal pachymetry | Corneal thickness measurement |
| 92250 | Fundus photography with interpretation and report | Retinal photography with physician interpretation |
| 92132 | Scanning computerized ophthalmic diagnostic imaging, anterior segment | Anterior segment OCT |
| 92133 | Scanning computerized ophthalmic diagnostic imaging; optic nerve | Optic nerve OCT (RNFL) |
| 92134 | Scanning computerized ophthalmic diagnostic imaging; retina | Macular OCT |
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CPT (Current Procedural Terminology) codes describe what was done—the services, procedures, and tests performed during the encounter. They are maintained by the American Medical Association (AMA). Examples: 92004 (comprehensive new patient eye exam), 92012 (intermediate established patient eye exam), 76514 (pachymetry). ICD-10 (International Classification of Diseases, 10th Revision) codes describe why it was done—the patient's diagnosis, symptoms, or condition being evaluated. They are maintained by the WHO and adapted for the U.S. by CMS. Examples: H52.13 (myopia, bilateral), H40.11 (open-angle glaucoma), E11.3519 (type 2 DM with diabetic retinopathy). Every claim requires both CPT codes (services) and ICD-10 codes (diagnoses).
The four principal optometric exam codes are: 92002 — Ophthalmological service, new patient, intermediate examination (medical); 92004 — Ophthalmological service, new patient, comprehensive examination (medical); 92012 — Ophthalmological service, established patient, intermediate examination (medical); 92014 — Ophthalmological service, established patient, comprehensive examination (medical). "New patient" = not seen by the provider in the past 3 years. "Comprehensive" requires refraction, biomicroscopy, dilated fundus exam, and a full case history. "Intermediate" includes history, external and ophthalmoscopic examinations, and prescription. Vision plans typically use these codes; medical insurers may use E&M codes (99201–99215) instead.
A superbill (also called a charge slip or encounter form) is the document that captures all the billable services performed during an encounter. It typically includes: patient demographic and insurance information, date of service, provider name and NPI (National Provider Identifier), CPT codes for services performed (checked or circled), ICD-10 diagnosis codes, modifiers if applicable, and the total charges. After the exam, the doctor or authorized staff completes the superbill, which is then used to generate the insurance claim. Paraoptometrics must understand the superbill to correctly document services and assist with claim submission.
Modifiers are two-digit codes appended to CPT codes to provide additional information about the service. Common modifiers in optometry: -25 (significant, separately identifiable E&M service on the same day as a procedure—used when billing both a medical exam and a minor procedure on the same day), -52 (reduced service—procedure partially completed), -RT/-LT (right/left—indicates which eye for procedures), -78 (unplanned return to the operating room), and -TC/-26 (technical component/professional component for diagnostic tests like visual fields when split between facility and physician). Using modifiers incorrectly can cause claim denials; missing required modifiers can trigger audits.
The NPI (National Provider Identifier) is a 10-digit unique identification number assigned to each healthcare provider by CMS (Centers for Medicare & Medicaid Services). Every claim submitted to a health insurance plan—Medicare, Medicaid, or private insurers—must include the treating provider's NPI. In an optometry practice with multiple doctors, each doctor has their own individual NPI. The practice may also have a group NPI for billing as an organization. Paraoptometrics in billing roles must know which doctor's NPI to include on each claim, particularly in practices where multiple providers see patients or where mid-level providers (optometrists, interns) must bill under a supervising doctor's NPI.
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