Read this first — the maternity global package ends 1 January 2027. Under the AMA’s CPT 2027 maternity restructure, the global obstetric package is retired: 17 codes are deleted, 12 are new and 6 are revised, effective 1 January 2027. Obstetric care moves to four separately reported phases — antepartum, labor management, delivery and postpartum. The codes referenced on this page remain valid through 31 December 2026. We are already migrating client workflows ahead of the change — see our 2027 maternity coding changes guide.
OB/GYN Medical Billing Services in Illinois
AMS Solutions provides specialized ob/gyn medical billing for practices across Illinois. From Chicago to Aurora and the rest of the state, our AAPC-certified billers handle the OB/GYN code set including the maternity care code family, which the AMA has restructured for 2027 (maternity global), the obstetric ultrasound code set (OB ultrasounds), gynecologic procedure codes (GYN procedures), office and outpatient E/M visit codes (well-woman) and the prior authorization for non-emergent C-sections (some payers), advanced ultrasound (3D/4D), and most gynecologic surgeries that Illinois practices need to navigate.
Illinois-specific payer landscape
We work with Illinois Medicaid (HealthChoice Illinois MCOs: Aetna Better Health, Blue Cross Community, CountyCare, Meridian, Molina, YouthCare), plus all major commercial plans: Blue Cross Blue Shield of Illinois, UnitedHealthcare, Aetna, Cigna, Humana, Health Alliance. Illinois operates under National Government Services (NGS) as the Medicare Administrative Contractor. Illinois falls under NGS Jurisdiction 6 with strict timely-filing requirements (180 days for Medicare).
OB/GYN services we bill
Our ob/gyn billing team handles maternity global packages, OB ultrasound billing, gynecologic procedure coding (colposcopy, IUD, hysterectomy), and well-woman annuals. We’re particularly strong at managing the common global maternity carve-outs, ICD-10 Z34/O09/Z3A code accuracy, and 99213+59 vs 99213+25 modifier disputes.
Why Illinois ob/gyn practices choose AMS
- Since 1992, handling Medicare billing across all 8 MAC jurisdictions including National
- 95%+ clean claim rate on first submission, vs 85-90% industry average
- Signed BAA for covered services
- AAPC-certified coders: every chart is reviewed by a CPC, COC, or CRC
Frequently asked questions
Yes — every plan listed in HealthChoice Illinois MCOs: Aetna Better Health, Blue Cross Community, CountyCare, Meridian, Molina, YouthCare. We verify benefits before each billing cycle.
We bill the maternity global package (59400, 59510, 59610, 59618) per payer rules — some carriers require unbundled billing, others want global. We verify which model each payer uses before each pregnancy.
Yes — we handle all OB ultrasound codes including the obstetric ultrasound code set with proper Z3A trimester staging and units billing for twins or multiples. Auditors love clean documentation here.
Ready to talk? Call 866-973-2221 or book a free 30-minute review with our team. We’ll audit a sample of your Illinois ob/gyn claims at no cost.