THOO H TAN (DO) – Obstetrics & Gynecology Physician, NPI 1104857127
Obstetrics & Gynecology Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
357 OBSTETRICS/GYNECOLOGY in IA
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Provider Addresses for THOO H TAN (DO)
1010, 4th Street Southwest, Mason City, Cerro Gordo County, Iowa, 50401, United States
SUITE 220
MASON CITY, IA 504012857
Phone: (641) 428-5100
Fax: (641) 428-5115
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 5 Open Payments records for all available years, with a total value of $189.
Total Amount is formed as General ($189) + Research ($0) + Ownership ($0) = $189.
Last reported payment date: 2024-07-16 • Largest payer in this snapshot: Astellas Pharma US Inc ($99).
Total Amount
$189
General + Research + Ownership
Payments
5
Total payment records
General Amount
$189
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-07-16
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2007-05-01
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 |
|---|---|---|---|---|
| I20070501000178 | I | Obstetrics/Gynecology | IA | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 31 | 20 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 22 | 22 | $0 |
| 99212 | Established patient office or other outpatient visit, 10-19 minutes | 17 | 16 | $0 |
Insurance plans in this area (ZIP 50401)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IA | |
| Nurse Practitioner | IA | |
| Family Practice, Emergency Medicine | IA | |
| Physician Assistant | IA | |
| - | IA | |
| Emergency Medicine | IA | |
| Nurse Practitioner | IA | |
| General Surgery | WI | |
| Certified Registered Nurse Anesthetist (Crna) | MT | |
| - | IA |
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