Laboratory — Cryopreservation
89337
Oocyte Cryopreservation (Egg Freezing)
Cryopreservation of mature oocytes (eggs). Used for elective fertility preservation, oncofertility cycles, and donor oocyte banking. This code is distinct from embryo cryopreservation (89258).
Billing Notes
89337 is specifically for mature oocyte freezing. Immature oocyte cryopreservation is experimental and generally not separately coded. Annual oocyte storage is billed with 89344.
Diagnosis Codes
Z31.62 (fertility preservation), C-codes (malignancy for oncofertility), E28.319 (diminished ovarian reserve)
Common Denial Reasons
- 89258 billed instead of 89337 for egg freezing
- Not covered for elective (non-medical) egg freezing
- Coverage requires documented medical necessity (oncofertility, diminished ovarian reserve)
Payer Notes
Elective egg freezing is typically not covered by commercial insurance. Oncofertility cases are frequently covered with proper diagnosis coding (C-code primary + Z31.62). Verify coverage before the cycle.
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