Peter Gregg, MD
NPI 1558564294 · Internal Medicine Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Peter Gregg, MD is a Internal Medicine Physician provider in Baltimore, MD (NPI 1558564294).
Provider details
- NPI number
- 1558564294
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- D0070580 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
525 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 275 | $133 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 71 | $17 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 69 | $5 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 38 | $187 |
| Admn Sarscov2 Vacc 1 Dose90480 | 32 | $45 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 80 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 201 | 57 |
| Amlodipine Besylate | 143 | 35 |
| Lisinopril | 122 | 32 |
| Gabapentin | 93 | 25 |
| Nifedipinebrand: Nifedipine Er | 78 | 21 |
| Pantoprazole Sodium | 74 | 23 |
| Diclofenac Sodium | 73 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$186 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-06-08
- Last updated
- 2014-06-18
Frequently asked questions
- What is Peter Gregg's NPI number?
- Peter Gregg's National Provider Identifier (NPI) is 1558564294, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Peter Gregg's specialty?
- Peter Gregg is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Peter Gregg located?
- Peter Gregg's practice location on file with NPPES is 1235 E Monument St, Baltimore, MD 21202-5327.
- What is Peter Gregg's phone number?
- The practice phone number listed in the NPPES registry for Peter Gregg is (410) 327-5100.
- Does Peter Gregg accept Medicare?
- Peter Gregg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Peter Gregg's NPI active?
- Yes — Peter Gregg's NPI (1558564294) is active in the NPPES registry as of the last update on 2014-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.