DR. GARY CHUN-I AN (MD) – Surgical Critical Care Physician, NPI 1093829830
Surgical Critical Care Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
83 GENERAL SURGERY in VT
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Provider Addresses for DR. GARY CHUN-I AN (MD)
University of Vermont Medical Center, 111, Colchester Avenue, Burlington, Chittenden County, Vermont, 05401, United States
BURLINGTON, VT 054011473
Phone: (802) 847-3790
Fax: (312) 695-1462
Type: Location
2, West Chicago Avenue, Magnificent Mile, River North, Near North Side, Chicago, North Chicago Township, Cook County, Illinois, 60654, United States
CHICAGO, IL 606224517
Phone: (312) 493-4872
Fax: (312) 864-9545
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $20.
Total Amount is formed as General ($20) + Research ($0) + Ownership ($0) = $20.
Last reported payment date: 2024-02-20 • Largest payer in this snapshot: CSL Behring ($20).
Total Amount
$20
General + Research + Ownership
Payments
1
Total payment records
General Amount
$20
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-02-20
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| CSL Behring | $20 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2018-11-14
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20181114001978 | I | General Surgery | VT | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 130 | 69 | $0 |
| 99291 | Critical care, first 30-74 minutes | 56 | 27 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 49 | 48 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 19 | 19 | $0 |
| 99238 | Hospital discharge day management, 30 minutes or less | 12 | 12 | $0 |
Insurance plans in this area (ZIP 05401)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GENERAL SURGERY | IL | 36556 | Insertion of central venous catheter for infusion, patient 5 years or older | 11 | 11 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | VT | |
| Nurse Practitioner | MA | |
| - | VT | |
| Certified Registered Nurse Anesthetist (Crna) | FL | |
| - | VT | |
| - | VT | |
| - | CT | |
| - | VT | |
| - | IN | |
| - | VT |
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