James Gregg, MD
NPI 1518100049 · Diagnostic Radiology Physician · Houston, TX
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Gregg, MD is a Diagnostic Radiology Physician provider in Houston, TX (NPI 1518100049).
Provider details
- NPI number
- 1518100049
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- N5694 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
3,111 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 1,319 | $8 |
| X-Ray of Abdomen, 1 View74018 | 428 | $9 |
| X-Ray of Chest, 2 Views71046 | 231 | $10 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 174 | $84 |
| Ct Scan of Blood Vessels of Chest With Contrast71275 | 105 | $84 |
| X-Ray of Hip, 2-3 Views73502 | 73 | $10 |
| Ct Scan of Chest With Contrast |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$394 across 3 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
Additional practice locations (1)
- 1 Baylor Plz # Ms 360Houston, TX 77030-3411Phone: (713) 798-6187
Registry dates
- Enumerated
- 2009-04-14
- Last updated
- 2018-04-06
Frequently asked questions
- What is James Gregg's NPI number?
- James Gregg's National Provider Identifier (NPI) is 1518100049, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Gregg's specialty?
- James Gregg is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is James Gregg located?
- James Gregg's practice location on file with NPPES is 7026 Old Katy Rd Ste 276, Houston, TX 77024-2187.
- What is James Gregg's phone number?
- The practice phone number listed in the NPPES registry for James Gregg is (713) 621-7436.
- Does James Gregg accept Medicare?
- James Gregg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Gregg's NPI active?
- Yes — James Gregg's NPI (1518100049) is active in the NPPES registry as of the last update on 2018-04-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.