MARK SIMPSON (PA-C) – Physician Assistant, NPI 1285087577
Physician Assistant
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
10,686 PHYSICIAN ASSISTANT in CA
Provider Addresses for MARK SIMPSON (PA-C)
309 E 2nd St
PA Office
Pomona, CA 917661854
Phone: (909) 623-9116
Type: Location
309, East 2nd Street, Edison Historic District, Pomona, Los Angeles County, California, 91766, United States
PA OFFICE
POMONA, CA 917661854
Phone: (909) 623-9116
Type: Mailing
Pioneers Memorial Hospital, 207, West Legion Road, Brawley, Imperial County, California, 92227, United States
BRAWLEY, CA 922277780
Phone: (760) 351-3333
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
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: 2021-07-01
PECOS data refreshed: 2026-06-15
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 |
|---|---|---|---|---|
| I20190613002691 | I | Physician Assistant | IN | TBD |
| I20210701001116 | I | Physician Assistant | WA | 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 |
|---|---|---|---|---|
| 99284 | Emergency department visit with moderate level of medical decision making | 103 | 98 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 59 | 59 | $0 |
| 93010 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 48 | 46 | $0 |
| 93042 | Electrocardiogram (ecg) 1 to 3 leads with review by physician only | 32 | 32 | $0 |
| 99285 | Emergency department visit with high level of medical decision making | 28 | 28 | $0 |
Insurance plans in this area (ZIP 91766)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | WA | |
| - | WA | |
| Nurse Practitioner | PA | |
| - | WA | |
| Emergency Medicine | MD | |
| - | CA | |
| Emergency Medicine | TX | |
| - | ID | |
| Emergency Medicine | IL | |
| Emergency Medicine | VA |
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