Crystal's MCW Coder Hub📋 The Rule (Quick Summary)
Count the Muscles: Strabismus coding is per muscle, not per eye. Horizontal vs. Vertical: Vertical muscles (Superior/Inferior Rectus, Obliques) pay more/differently than Horizontal ones (Lateral/Medial Rectus). Transposition: Moving a muscle to do the work of another is a different code set.
💰 CPT Selection Logic
(Base Codes - Horizontal)
- 67311: One horizontal muscle.
- 67312: Two horizontal muscles (same eye).
(Base Codes - Vertical/Oblique)
- 67314: One vertical muscle (excluding superior oblique).
- 67316: Two or more vertical muscles (same eye).
- 67318: Superior Oblique muscle surgery.
⚠️ The “Add-On” Gold Mine
Never miss these +Codes (List them separately!):
- +67332 (Scarring/Re-do): Use if the patient has had prior strabismus surgery on this eye.
- +67331 (Posterior Fixation): The “Faden” procedure (suturing muscle far back).
- +67334 (Posterior adjustable sutures): If they leave sutures long to adjust later.
- +67335 (Superior Oblique Expander): Specific to SO surgery.
⚠️ Modifier Watch
- -50 (Bilateral): YES. If operating on muscles in both eyes (e.g., Medial Rectus Recession OU), bill the code with -50.
- -51: Use if doing Horizontal (67311) AND Vertical (67314) on the same eye.
🚨 Documentation Alerts (Query Triggers)
- “Previous Surgery”: Check the history! If they had eye muscle surgery 20 years ago, you must bill the +67332 add-on. It adds significant RVUs for the difficulty of scar tissue.
- Number of Muscles: Explicitly check: “Medial Rectus AND Lateral Rectus recessed?” → That’s 67312, not 67311 x2.