WILLIAM I PARKER (MD) – Emergency Medicine Physician, NPI 1356459903
Emergency Medicine Physician
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Profile Insights
NPPES metrics only — not quality of care.
483 EMERGENCY MEDICINE in IA
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Provider Addresses for WILLIAM I PARKER (MD)
Mercy Family Clinic - Regency, 621, South Illinois Avenue, Regency, Mason City, Cerro Gordo County, Iowa, 50401, United States
SUITE 103
MASON CITY, IA 504015489
Phone: (641) 494-3041
Fax: (641) 494-3059
Type: Mailing
MercyOne North Iowa Medical Center, 1000, 4th Street Southwest, Mason City, Cerro Gordo County, Iowa, 50401, United States
SUITE ER
MASON CITY, IA 504012800
Phone: (641) 422-7234
Fax: (641) 422-6373
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 4 Open Payments records for all available years, with a total value of $336.
Total Amount is formed as General ($336) + Research ($0) + Ownership ($0) = $336.
Last reported payment date: 2024-05-19 • Largest payer in this snapshot: Abbott Laboratories ($181).
Total Amount
$336
General + Research + Ownership
Payments
4
Total payment records
General Amount
$336
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-05-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Abbott Laboratories | $181 |
| Boston Scientific Corporation | $155 |
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: 2025-02-03
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20040302000687 | I | Emergency Medicine | IA | TBD |
| I20250203003538 | I | Emergency Medicine | FL | 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 |
|---|---|---|---|---|
| 99285 | Emergency department visit with high level of medical decision making | 195 | 190 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 77 | 75 | $0 |
| 99283 | Emergency department visit with low level of medical decision making | 67 | 64 | $0 |
Insurance plans in this area (ZIP 50401)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Emergency Medicine | FL | |
| Emergency Medicine | FL | |
| Emergency Medicine | TX | |
| Family Practice | GA | |
| Family Practice | CA | |
| Nurse Practitioner | FL | |
| Emergency Medicine | PA | |
| Emergency Medicine | FL | |
| Nurse Practitioner | MA | |
| Emergency Medicine | FL |
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