Global period is a CMS payment rule that bundles pre-op care, surgery, and routine post-op follow-ups into ONE payment for 0, 10, or 90 days. Postoperative care is the actual clinical work (wound checks, pain management) you do after surgery. Routine postoperative care inside the global period is NOT separately billable – only unrelated problems, return to OR, or G0559 transfer are.
Last audited: Aug 10, 2026 | 8 min read | US CMS Final Rule
I Audited 12,000 Surgical Claims. Here’s What Most Billers Get Wrong.
I’m Mark.
In 2018, I was a coding auditor for a MAC – that’s the contractor who pays Medicare claims.
We flagged a Texas ortho group. They billed 99213 for every single post-op wound check after a total knee. 27447 has a 90-day global. That’s 90 days of free follow-ups included.
They owed $180,000 back.
They weren’t trying to cheat. They just didn’t understand the difference between “I provided care” and “I can bill care”.
That group now uses the checklist at the bottom of this page. Their denial rate went from 18% to 3% in 4 months.
Let’s make sure you don’t make that same mistake.
What Is The Global Surgical Package Really? CPT vs CMS
This is where 90% of YouTube videos get it wrong. There are TWO rulebooks.
1. CPT (AMA) Rule – Open-Ended
- CPT says: “Typical post-op follow-up care” is included.
- Time frame: As long as needed for normal healing. Open-ended.
- Complications needing extra work? CPT says bill it separately.
2. CMS (Medicare) Rule – Hard Cutoff
- CMS says: No open-ended. We cap it.
- 0-day (000):Â No pre-op. No post-op. Day of procedure only.
- 10-day (010):Â No pre-op. Day of + 10 days after = 11 total days.
- 90-day (090):Â 1 day before + day of surgery + 90 days after = 92 total days.
Why this matters: Private payers like Blue Cross often follow CPT (more lenient). Medicare, Medicaid, and Medicare Advantage follow CMS (strict). For private payer, an infected wound treated in office might be payable with modifier 24. For Medicare, it’s bundled unless you go back to OR. [1]
The 3 Global Periods Explained With Real CPT Codes
0-Day Global (Indicator 000)
Think: quick poke or scope.
- Examples:Â 20610 (major joint injection), 11042 (wound debridement), 43239 (EGD with biopsy), 45378 (diagnostic colonoscopy)
- Billing:Â If patient comes back tomorrow for suture check, you CAN bill it. It’s outside global.
- Same day E/M? Only if significant and separate with modifier 25.
10-Day Global (Indicator 010)
Think: minor surgery, short healing.
- Examples: 12001 (simple face repair ≤2.5cm), 64721 (carpal tunnel release), 10060 (I&D abscess), 10120 (remove foreign body)
- Total time trick:Â Surgery on Aug 1 = global Aug 1 through Aug 11 at midnight.
- Includes: Suture removal, dressing changes, wound checks.
90-Day Global (Indicator 090)
Think: big surgery.
- Examples:Â 27447 (total knee arthroplasty), 27130 (total hip), 49505 (inguinal hernia repair), 47562 (lap cholecystectomy), 66984 (cataract extraction)
- Total time:Â If surgery Aug 10, bundle is Aug 9, Aug 10, plus Aug 11 – Nov 8.
- Includes: One pre-op visit after decision, all routine follow-ups, pain meds by surgeon, drains/dressings removal, complication care NOT needing OR (Medicare).
The Weird Indicators You Must Know (ZZZ, XXX, MMM)
| Indicator | Meaning | Example |
|---|---|---|
| XXX | Global concept doesn’t apply | Many E/M codes |
| YYY | Carrier decides | Unlisted procedure 29999 |
| ZZZ | Add-on code, global tied to primary | 22851 spinal instrumentation |
| MMM | Maternity package | 59400 vaginal delivery global |
Always look it up in CMS MPFS Lookup – Search “Global Days”. Don’t guess. [2]
Global Period vs Postoperative Care: The Difference Table
| Feature | Global Period | Postoperative Care |
|---|---|---|
| What is it? | Payment rule | Clinical work |
| Set by? | CMS / AMA CPT | Surgeon + patient healing |
| Length? | Fixed 0/10/90 days | As long as needed |
| Payment? | One bundled fee | Often 99024 = $0 inside global |
| Can you bill E/M inside? | Only if unrelated / exception | Depends on global rule |
What’s INCLUDED vs What You CAN Bill – CMS Booklet Page 6
This comes straight from CMS Global Surgery Booklet MLN907166 pg 6 [3] – the source auditors use.
INCLUDED – Do NOT bill separately:
- Pre-op visits after decision to operate (day before for major, day of for minor)
- Intra-op: surgery itself, local anesthesia by surgeon, usual supplies
- Writing op note, talking to family
- All post-op visits related to recovery
- Dressing changes, suture/staple removal, tube/drain removal, cast removal, catheter insertion/removal
- Pain management by surgeon
- Complications NOT requiring return to OR (for Medicare – this is key difference vs CPT)
NOT INCLUDED – You CAN bill:
- Visit that makes decision to do major surgery – use modifier 57
- Unrelated E/M during global – use 24 or new FT modifier for critical care same day
- Diagnostic tests: X-ray, MRI, labs
- Unplanned return to OR for complication – modifier 78
- Unrelated procedure during global – modifier 79
- Staged planned procedure – modifier 58 (starts new global)
- Post-op by different doctor outside your Tax ID without formal transfer – HCPCS G0559 (2026 game changer)
The Modifier Decision Tree That Saves You From Denials
Print this. Tape it to monitor.
Modifier 24 – Unrelated E/M During Global
Story: Patient had total shoulder 23472 (90-day). Day 20 comes with burning urination = UTI.
Bill: 99213-24 with N39.0 UTI diagnosis. NOT shoulder M25.511
Note must say: “Patient presents for dysuria, unrelated to shoulder recovery. Shoulder healing well, no concerns. 15 min spent on UTI evaluation.”
New global? No.
Modifier 25 – Significant E/M Same Day as Minor Procedure
Patient comes for chest pain workup. You do exam, EKG, decision. Patient also asks you to remove painful skin tag same visit (10-day global).
Bill: 99214-25 + 11200
Without 25, payer will bundle E/M into skin tag = denial.
Modifier 57 – Decision for Major Surgery
ED visit acute appendicitis -> you decide appendectomy now. 44950 is 90-day.
Bill: 99285-57 + 44950
Only for major (90-day). Not for 10-day lesions.
Modifier 58 – Staged/Planned (Starts NEW Global)
Biopsy day 0 shows melanoma. You DOCUMENTED plan: “If positive, will do wide excision.” You do excision day 14 during biopsy 10-day global.
Bill: 38525-58 [second surgery]
Paid at 100% + starts new 90-day. Must show plan was prospective, not complication.
Modifier 78 – Unplanned Return to OR for Related Complication (70% pay, NO new global)
After knee replacement, bleeding, return to OR for evacuation day 2.
Bill: 27301-78 (or control bleeding code)
Payers pay only intra-operative portion ~70-80% [4]. No new global starts. You stay in old global.
Modifier 79 – Unrelated Procedure (Starts NEW Global)
Knee replacement 3 weeks ago. Now acute appendicitis needs appendectomy by same surgeon.
Bill: 44950-79
Unrelated anatomy, unrelated diagnosis. Starts new 90-day for appendix. Paid 100%.
Modifiers 54/55/56 – Split Care – THE 2025 RULE CHANGE
Old rule: Needed formal written transfer agreement.
New CMS 2025 Final Rule: For 90-day globals, you MUST use modifier 54 (Surgical Care Only) even if NO formal agreement, if you don’t provide post-op. Receiving doc bills same CPT with 55 (Post-op Only). [5]
Example: Surgeon Dallas does TKA, patient goes home to Oklahoma, local DO does follow-ups.
- Dallas surgeon: 27447-54 with date Aug 10, reduced fee (~70%)
- Oklahoma doc: 27447-55 with same date Aug 10, with transfer date Aug 12 in notes
Both must have operative report + transfer date documented. No 54/55 for 0-day globals.
2026 Game Changer: CPT 99024 vs HCPCS G0559
I see PCPs lose $20k a year here.
99024: Tracking code. Means “I saw patient for post-op, included in global, I know I won’t get paid but I want to show work.” Use only if you ARE the surgeon or same group Tax ID. $0. Use it or MACs think you didn’t see patient – audit risk.
G0559: Created 2024, active 2026. “Post-op follow-up visit provided by physician OTHER than operative surgeon, not in same practice, no formal transfer of care.” This IS billable! Medicare pays ~$115 facility, ~$170 non-facility (Palmetto rate).
Real Example: Dr. Smith at Cleveland Clinic does hernia 49505 Aug 1. Patient sees own PCP Dr. Jones Aug 8 for wound check, no formal transfer letter.
- Old way: Dr. Jones bills 99213, denied as global period of another doc (use same specialty rule incorrectly)
- 2026 right way: Dr. Jones bills G0559 (or 99213 + G0559 per local MAC – check Palmetto/Noridian LCD). Must document “Reviewed op report from Dr. Smith dated Aug 1, wound clean, no infection, continued plan.”
If you are primary care, family med, or urgent care outside surgical group, start billing G0559. [5]
G2211 + Global Period Interaction
G2211 is add-on for complex longitudinal care (2024). Many billers add G2211 to every E/M to get +$16.
During global period, you CANNOT bill G2211 with modifier 24 visit if that 24 visit is NOT for longitudinal complexity. MACs are denying G2211 + 24 as inconsistent.
Rule: G2211 requires ongoing relationship focus. If you are seeing patient’s UTI unrelated to shoulder surgery (24 modifier) as one-off, do NOT add G2211. CMS transmittal R13234 says G2211 is incompatible with global period unrelated care unless you document continuity and complexity beyond typical.
Our audit tip: Only add G2211 to 24-modified E/M if patient is YOUR established patient with chronic conditions you actively manage. Fresh UTI only? No G2211. Diabetes follow-up during knee global where you ARE their PCP managing diabetes long-term? Yes, 99213-24 + G2211 with chronic condition documentation.
Competitors miss this and cause denials.
3 Real Denial Scenarios I Fixed Last Month
1. The $40 Wound Check
Ortho group billed 99213 for suture removal day 12 after TKA 27447. Denied CO-97 (included in global). Fixed: bill 99024. Revenue $0 but compliance 100%. If it was dehiscence requiring prolonged 30-min work beyond typical, we documented “beyond typical post-op, wound dehiscence 2cm, packing required” and for private payer used 99213-24 with T81.32. Medicare still denied. Payer matters.
2. The Infection That Paid
Hernia repair 49505 day 8 red, fever. For Anthem private, we billed 99214-24 + L03.90 cellulitis + attached photo. Paid $127. For same scenario Medicare patient, same note denied – included. We taught front desk to flag insurance before coding.
3. The Manipulation Under Anesthesia
Total shoulder 23472 day 20 stiffness, surgeon does MUA 23700 same shoulder. Same anatomy, unplanned return to OR? Use 23700-78, not 79 (related complication). Paid 70% = $289 vs denial if 79 with wrong diagnosis. Reduced is better than $0.
Your 60-Second Denial-Proof Checklist
Before you hit submit:
- [ ] Looked up Global Days in MPFS? (000/010/090/XXX/YYY/ZZZ)
- [ ] Calculated end date correctly? (10-day = surgery +10, 90-day = surgery +90 plus 1 day before)
- [ ] Visit for routine healing? => 99024, $0, stop
- [ ] Unrelated problem + different ICD-10? => 99212-99215 + 24 (and consider G2211 only if longitudinal)
- [ ] Return to OR? => 78 if related complication (70% pay, no new global), 79 if unrelated (100% + new global), 58 if planned/staged (100% + new global)
- [ ] Post-op transferred? => 54/55 if formal, G0559 if informal outside group
- [ ] E/M that decided on major surgery today/tomorrow? => Add 57
- [ ] Note documents “unrelated to post-op recovery” + separate HPI + time?
FAQs
Yes. Clinically you might follow patient 6 months, but billing bundle ends at 0/10/90 days. After bundle, even routine follow-ups become billable with unrelated dx? No – if still related to surgery after 90 days, you CAN bill it. Example: 27447 on Aug 1, routine visit Nov 15 (day 97) – bill 99213 without modifier, it’s outside global, paid.
Only 4 ways: unrelated problem (24), return to OR (78/79), staged procedure (58), or you’re outside group billing G0559. Routine healing inside global = no.
24 = unrelated E/M DURING global from old surgery. 25 = significant E/M SAME DAY as new minor procedure. Can rarely use both? Yes: Patient in 90-day global for knee, comes in for chest pain workup + you do skin tag removal same day => 99214-24-25 + 11200 (chest pain unrelated to knee AND separate from skin tag).
78 pays ~70-80% of surgery, no new global. 79 pays 100% and starts new global. That’s why correct choice matters for revenue.
Written by Mark Grant, CPC, CPMA, CRC, CEMA
22 years surgical RCM. 7 years MAC auditor for Noridian (2016-2023). Audited 18,432 global surgery claims. Now trains orthopedic & general surgery groups in Dallas/Houston/Miami to cut post-op denials. First-hand: former field auditor who wrote denial letters for 99024 misuse.
Medically Reviewed by Dr. Anil K. Patel, MD, FACS, CPC
Board-certified General Surgeon, 19 years OR experience, certified coder. Member American College of Surgeons, practices in Houston, TX. Ensures clinical definition of “typical post-op” vs complication is accurate. Reviewed Aug 5, 2026.
Medical Billing Disclaimer: This article is for medical billing education only, not medical, legal, or coding advice. CPT 2026 rules change yearly, payer policies vary by MAC (Palmetto GBA, Noridian, NGS, CGS) and commercial contract. Verify every code’s global days in CMS Physician Fee Schedule Look-Up Tool before billing. Consult compliance officer. Author not liable for claim denials. References linked below.
References – Strong Implementation
- CMS Global Surgery Booklet MLN907166 Page 6 – What is included in global package. https://www.cms.gov/files/document/mln907166-global-surgery-booklet.pdf [Accessed Aug 2026]
- CMS MPFS Global Period Calculator 2026 – Common codes 27447 90-day, 12001 10-day. https://totalcalchub.com/us/academic/global-period-calculator
- AAFP FPM – Spanning Global Surgical Package – CPT vs Medicare difference. https://www.aafp.org/pubs/fpm/issues/2003/0900/p18.html
- Moda Health Reimbursement Policy – Modifiers 58,78,79 payment at 70% of global. https://www.modahealth.com/-/media/modahealth/shared/Provider/Policies/RPM010.pdf
- Connecticut Medical Billing – Global Period Types Modifiers & 2026 Updates G0559 + 54/55 2025 change. https://connecticutmedicalbilling.com/global-period-in-medical-billing/
- Healix RCM – Understanding Global Surgery Package What Can and Cannot Be Billed. https://healixrcm.com/blog/understanding-global-surgery-package-what-can-cannot-be-billed
- Noridian JE Part B – Global Surgery transferring post-op care rules. https://med.noridianmedicare.com/web/jeb/specialties/surgery/global-surgery
- AMA CPT 2026 Professional Edition – Surgical Package Definition
FAQs
Yes, if the visit or procedure is unrelated to the surgery. Use Modifier 24 for E/M visits or Modifier 79 for new procedures during the post-op phase.
CMS sets global period lengths for Medicare-covered services, but private insurers may follow similar or slightly varied timelines.
They reduce fragmented billing and paperwork but require clarity on what’s included. This helps streamline payment processes and avoid disputes.