John Colby, MD, PHD
NPI 1700205374 · Neuroradiology Physician · Greenbrae, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Colby, MD, PHD is a Neuroradiology Physician provider in Greenbrae, CA (NPI 1700205374).
Provider details
- NPI number
- 1700205374
- Entity type
- Individual
- Primary specialty
- Neuroradiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- A139185 (CA)
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
12 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
9,433 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 | 1,009 | $10 |
| Ct Scan Head Or Brain Without Contrast70450 | 571 | $46 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 365 | $101 |
| Mri Scan of Brain Without Contrast70551 | 280 | $81 |
| X-Ray of Shoulder, Minimum of 2 Views73030 | 238 | $11 |
| Mri Scan of Brain Before and After Contrast70553 | 220 | $127 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$120 across 1 record (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
- 2014-04-10
- Last updated
- 2020-07-01
- Certified
- 2020-07-01
Frequently asked questions
- What is John Colby's NPI number?
- John Colby's National Provider Identifier (NPI) is 1700205374, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Colby's specialty?
- John Colby is listed in the NPPES registry with a primary specialty of Neuroradiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Colby located?
- John Colby's practice location on file with NPPES is 250 Bon Air Rd, Greenbrae, CA 94904-1702.
- What is John Colby's phone number?
- The practice phone number listed in the NPPES registry for John Colby is (415) 925-7301.
- Does John Colby accept Medicare?
- John Colby is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Colby's NPI active?
- Yes — John Colby's NPI (1700205374) is active in the NPPES registry as of the last update on 2020-07-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.