DR. GREGORY GRIMBERG (MD) – Surgery Physician, NPI 1104245307
Surgery Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
826 GENERAL SURGERY in MD
Provider Addresses for DR. GREGORY GRIMBERG (MD)
4940 Eastern Ave Rm 3933D
Baltimore, MD 212242735
Phone: (410) 550-6875
Fax: (410) 550-1822
Type: Location
250 S CRESCENT DR
MASON CITY, IA 504012926
Phone: (641) 494-5300
Fax: (641) 494-5321
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 13 Open Payments records for all available years, with a total value of $398.
Total Amount is formed as General ($398) + Research ($0) + Ownership ($0) = $398.
Last reported payment date: 2024-12-20 • Largest payer in this snapshot: Phathom Pharmaceuticals, Inc. ($155).
Total Amount
$398
General + Research + Ownership
Payments
13
Total payment records
General Amount
$398
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-20
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: 2020-09-10
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 |
|---|---|---|---|---|
| I20200910002699 | I | General Surgery | 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 |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 135 | 35 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 84 | 75 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 74 | 53 | $0 |
| 91040 | Study of esophageal sensation by balloon distension | 54 | 38 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 35 | 30 | $0 |
Insurance plans in this area (ZIP 21224)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| P S Y C H I A T R Y | IA | |
| Orthopedic Surgery | IA | |
| Cardiovascular Disease (Cardiology), Critical Care (Intensivists) | IA | |
| - | IA | |
| Thoracic Surgery | MS | |
| Cardiovascular Disease (Cardiology) | IA | |
| Physician Assistant | IA | |
| Vascular Surgery | NY | |
| Physician Assistant | IA | |
| Orthopedic Surgery | NY |
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