Geoffrey P. Colby, M.D., PH.D.
Neurological Surgery Physician · Los Angeles, CA
Geoffrey P. Colby, M.D., PH.D. is a neurological surgery physician with a practice address in Los Angeles, California, and NPI 1144373739, issued on Jan 19, 2007. Check the license (California A149100, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Geoffrey P. Colby
- Credential
- M.D., PH.D.
- Primary taxonomy
- Neurological Surgery Physician 207T00000X
- License numbers
- A149100 CA
74356 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 300 Medical Plaza, Los Angeles, CA 90095
- Phone
- (310) 825-5111
- Enumerated
- Jan 19, 2007
- Record last updated
- Jun 27, 2025
- Fax
- (310) 825-7245
- Medicare enrollment
- Enrolled (PECOS I20170810001843); accepts Medicare assignment
- Medical or professional school
- Columbia University College Of Physicians And Surgeons, 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest neurological surgery physician records → All 929 in California → Look up another NPI →
Also registered at 300 Medical Plaza
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alon Avidan, MDNeurology Physician1154437069
- Kalina Babeva, PHDClinical Psychologist1083121719
- Robert Baloh, MDNeurology Physician1801811252
- Ulrich Batzdorf, MDNeurological Surgery Physician1801811047
- Jeff Bronstein, MDNeurology Physician1114940731
- Yuri Bronstein, MDNeurology Physician1992724009
Verify Geoffrey P. Colby in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A149100Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average neurological surgery physician in 2024
13 Medicare Part D claims, against an average of 172 among the 4,378 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 72.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $117,873.84
118 payments; by number, the most common kind was travel and lodging; the largest payer was Stryker Corporation. The 5,377 providers of this specialty with any payment received $14,925.58 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- The Regents OF The University OF CaliforniaLos Angeles, CA
- Tucson Physician Group Holdings LLCTucson, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Geoffrey P. Colby among 929 neurological surgery physician records in California
Geoffrey P. Colby, M.D., PH.D. is one of 929 neurological surgery physician records with a practice address in California. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 38% of them.
- NPI issued2007 · 38% of these records are older, 48% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2006 · median 2005 among the 612 with a school on file
- Record last updated2025 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207T00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurological Surgery Physician providers in California
There are 929 neurological surgery physician records in California.
All 929 in California → Every provider in Los Angeles → Neurological Surgery Physician nationwide →
The 8 neurological surgery physician records with the nearest ZIP codes
- James Ausman, MDLos Angeles, CA 900951902919160
- Ulrich Batzdorf, MDLos Angeles, CA 900951801811047
- Marvin Bergsneider, MDLos Angeles, CA 900951174502629
- Antonio De Salles, MDLos Angeles, CA 900951821009598
- John Frazee, MDLos Angeles, CA 900951255412300
- Itzhak Fried, MDLos Angeles, CA 900951093726788
- Langston Holly, MDLos Angeles, CA 900951063437192
- Jacqueline King, NPLos Angeles, CA 900951356366322
Common questions
What is Geoffrey P. Colby, M.D., PH.D.'s NPI number?
Geoffrey P. Colby, M.D., PH.D.'s National Provider Identifier (NPI) is 1144373739, issued on Jan 19, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Geoffrey P. Colby, M.D., PH.D. located?
The NPPES record lists a practice address at 300 Medical Plaza, Los Angeles, CA, 90095. Phone: (310) 825-5111. Providers update this record themselves, so call before visiting.
How can I verify Geoffrey P. Colby, M.D., PH.D.'s license?
NPPES lists California license number A149100, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Geoffrey P. Colby, M.D., PH.D. prescribe under Medicare Part D?
In 2024, Geoffrey P. Colby, M.D., PH.D. had 13 Medicare Part D claims; the average among neurological surgery physician prescribers was 172. Part D covers Medicare prescriptions only.
What is Geoffrey P. Colby, M.D., PH.D.'s MIPS final score?
The 2023 MIPS final score is 72.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.