Gynaecology & Obstetrics Modifier Cheatsheet
0018 | High BMI | +50% | BMI of 35 or greater. Only applicable to incisional procedures. Height and weight needed. |
0005 | Reduction modifier | Multiple proceduressame anesthetic | Add after all procedure codes have been added. Add to all procedure codes unless a code specifies 0005 doesn't apply. Not for consultation items, add-on codes, or nerve blocks. |
0007 | Own monitoring equipment | +15 units | Rooms: for procedures under IV sedation. Hospital/unattached theatre: where the appropriate equipment isn't provided by the hospital. |
0074 | Endoscopic procedures, own equipment | +33.33% | Of the procedure fee, if the doctor owns the endoscopic equipment. |
0075 | Endoscopic procedures, own rooms | — | Doctor must own or pay rent for the rooms. |
0013 | Endoscopic examination under anesthesia | 50% | If a related endoscopic examination is done at the same operation, only 50% of the endoscopy units may be charged (e.g. cystoscopy with bladder repair). |
0008 | Specialist surgeon assistant | 33.33% / 40% | Calculate using all procedure codes and modifiers except 0011. Use only if a specialist assistant is imperative — otherwise use 0009. |
0009 | Assistant | 20%min. 36 units | Calculate using all procedure codes and modifiers except 0011. |
Also relevant: 1807 — add for laparoscopic procedures, unless the procedure code already specifies laparoscopic (e.g. 2340 Laparoscopic.
Building a gynaecology/obstetric surgical claim
Same principle as any surgical claim in Nova. This order is fixed — skip steps that don't apply, but never reorder the ones that do.
- Procedure line(s), highest value first - Order procedure codes from highest unit value to lowest. Modifiers can only reference lines already above them.
- If BMI is greater than 35 the 0018(High BMI modifier) - Must come before 0009 so it appears in the Apply to list when the assistant fee is calculated.
- If emergency 0011(Surgeon's emergency time) - Applies to C-sections. Does not apply to vaginal deliveries.
- If assistant is present 0009 or 0008(Assistant fee) - Added last so all applicable procedures and modifiers (e.g. 0018) are in the "Apply to" list. Calculated on all procedure codes and modifiers except 0011.
- If emergency + assistant 0011(Assistant's emergency time) - A separate 0011 line for the assisting doctor — added after 0009/0008, not grouped with the surgeon's 0011.
Critical rules
- Emergency time (0011) applies to C-sections, not vaginal deliveries. Adding 0011 to a vaginal delivery claim is incorrect regardless of how urgent the delivery was.
- Mutually exclusive codes can't be combined. Many codes already accommodate services specified in other codes — e.g. 2443 (Dilatation and Curettage) may not be used together with 2437 (Hysteroscopy and sampling of endometrium and/or polypectomy, with or without D&C). Refer to the SASOG guide for the full list.
- Procedures must be added before modifiers, highest value first. The Apply to list only shows lines already above the modifier on the invoice.
- 0005 goes on every procedure code, with exceptions. Add it to all procedure codes done under the same anaesthetic unless a specific code states 0005 doesn't apply to it.
- 1807 (laparoscopic addition) isn't always needed. Skip it when the procedure code itself already specifies laparoscopic (e.g. 2340).