Doctor profile · Federal record
Dr. Thoo Tan, DO
Obstetrics & Gynecology Physician (CMS: Obstetrics/Gynecology) · Mason City, IA
- NPI 1104857127
- Accepts Medicare
- 36 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1010 4Th St Sw, Suite 220
Mason City, IA 504012857
(641) 428-5100
fax (641) 428-5115
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- July 14, 2025
- Year of graduation
- 1990 — 36 yrs since
- Specialty taxonomy
- 207V00000X — NUCC code
- State license (1)
- Iowa #02918
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1104857127. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
70
Distinct HCPCS
3
Medicare allowed
$4,158
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 31 | 20 | $62 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 22 | 22 | $77 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 17 | 16 | $33 |
In context: peer comparison
Among 6 peers in Mason City Obstetrics & Gynecology Physician, average services per provider: 25. This provider delivers 2.8× the peer median.Open Payments
Industry payments received
All-time total
$31
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Intuitive Surgical, INC. | 1 | $31.44 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
47
Patients
0
Total drug cost
$1,147
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Estradiol | Generic | 29 | 0 | $800 |
| Oxybutynin Chloride ER (Oxybutynin Chloride) | Brand | 18 | 0 | $347 |
Frequently asked questions
What is Dr. Thoo Tan's medical specialty?
Dr. Thoo Tan practices Obstetrics & Gynecology Physician in Mason City, IA.
Where does Dr. Thoo Tan practice?
Dr. Thoo Tan practices at 1010 4Th St Sw, Mason City, IA 504012857. Office phone: 6414285100.
What is Dr. Thoo Tan's NPI?
Dr. Thoo Tan's National Provider Identifier (NPI) is 1104857127, issued by NPPES.
Does Dr. Thoo Tan accept Medicare assignment?
Yes. Dr. Thoo Tan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Thoo Tan commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); New patient office or other outpatient visit (HCPCS 99203); Established patient office or other outpatient visit (HCPCS 99212). Source: CMS Medicare Physician & Other Practitioners file.