Doctor profile · Federal record
Dr. William Parker, MD
Emergency Medicine Physician (CMS: Emergency Medicine) · Mason City, IA
- NPI 1356459903
- Accepts Medicare
- 35 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1000 4Th St Sw, Suite ER
Mason City, IA 504012800
(641) 422-7234
fax (641) 422-6373 - Mailing address
-
621 S Illinois Ave, Suite 103
Mason City, IA 504015489
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- October 11, 2023
- Year of graduation
- 1991 — 35 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- Iowa #28723
- Medicaid
- IA #2073189
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1356459903. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
339
Distinct HCPCS
3
Medicare allowed
$45,037
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 195 | 190 | $164 | |
99284 |
Emergency department visit with moderate level of medical decision making | 77 | 75 | $113 | |
99283 |
Emergency department visit with low level of medical decision making | 67 | 64 | $67 |
In context: peer comparison
Among 4 peers in Mason City Emergency Medicine Physician, average services per provider: 95. This provider delivers 3.6× the peer median.Open Payments
Industry payments received
All-time total
$189
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Boston Scientific Corporation | 1 | $155.07 | |
| Abbott Laboratories | 1 | $33.50 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
135
Patients
132
Total drug cost
$1,140
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisone | Generic | 19 | 18 | $58 |
| Doxycycline Monohydrate | Generic | 18 | 17 | $289 |
| Azithromycin | Generic | 16 | 16 | $102 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 16 | 16 | $98 |
| Cefdinir | Generic | 15 | 14 | $271 |
| Tramadol Hcl | Generic | 14 | 14 | $32 |
| Levofloxacin | Generic | 13 | 13 | $83 |
| Ciprofloxacin Hcl | Generic | 12 | 12 | $77 |
| Methylprednisolone | Generic | 12 | 12 | $131 |
Hospital affiliations
Frequently asked questions
What is Dr. William Parker's medical specialty?
Dr. William Parker practices Emergency Medicine Physician in Mason City, IA.
Where does Dr. William Parker practice?
Dr. William Parker practices at 1000 4Th St Sw, Mason City, IA 504012800. Office phone: 6414227234.
What is Dr. William Parker's NPI?
Dr. William Parker's National Provider Identifier (NPI) is 1356459903, issued by NPPES.
Does Dr. William Parker accept Medicare assignment?
Yes. Dr. William Parker accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Parker commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with high level of medical decision making (HCPCS 99285); Emergency department visit with moderate level of medical decision making (HCPCS 99284); Emergency department visit with low level of medical decision making (HCPCS 99283). Source: CMS Medicare Physician & Other Practitioners file.