RAN GUAN (M.D., M.S) – Hospitalist Physician, NPI 1275774192
Hospitalist Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
2,941 INTERNAL MEDICINE in WI
Loading map...
Provider Addresses for RAN GUAN (M.D., M.S)
PO BOX 735044
CHICAGO, IL 606735044
Phone: (800) 326-2250
Type: Mailing
Aurora Medical Center in Grafton, 975, North Port Washington Road, Grafton, Ozaukee County, Wisconsin, 53024, United States
GRAFTON, WI 530249201
Phone:
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $49.
Total Amount is formed as General ($49) + Research ($0) + Ownership ($0) = $49.
Last reported payment date: 2023-12-15 • Largest payer in this snapshot: ABBVIE INC. ($49).
Total Amount
$49
General + Research + Ownership
Payments
3
Total payment records
General Amount
$49
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-12-15
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $49 |
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: 2012-08-16
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 |
|---|---|---|---|---|
| I20120816000343 | I | Internal Medicine | WI | 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 |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 515 | 206 | $0 |
| 99239 | Hospital discharge day management, more than 30 minutes | 164 | 157 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 112 | 108 | $0 |
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 82 | 47 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 26 | 18 | $0 |
Insurance plans in this area (ZIP 60673)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | WI | |
| Family Practice | WI | |
| Family Practice | IL | |
| Geriatric Medicine, Internal Medicine | WI | |
| - | WI | |
| - | WI | |
| - | IL | |
| Family Practice | WI | |
| - | OH | |
| - | WI |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.