Richard Martin Grandquist, PA-C
Medical Physician Assistant · Colton, CA
Richard Martin Grandquist, PA-C is a medical physician assistant with a practice address in Colton, California, and NPI 1578962049, issued on Aug 20, 2014. Check the license (California 51840, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Richard Martin Grandquist
- Credential
- PA-C
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- 51840 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 N Pepper Ave Ste 107, Colton, CA 92324
- Phone
- (650) 996-8240
- Enumerated
- Aug 20, 2014
- Record last updated
- Aug 20, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 3,376 in California → Look up another NPI →
Also registered at 400 N Pepper Ave Ste 107
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel Dubrow, PA-CPhysician Assistant1851940423
- Brian Edison, P.A.Physician Assistant1245600568
- Christine LePhysician Assistant1619544046
- Maria Mejia, PAPhysician Assistant1215307640
- Chloe PappasPhysician Assistant1447725114
- Vikram Raj, D.O.Emergency Medicine Physician1053323923
Verify Richard Martin Grandquist in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 51840Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average medical physician assistant in 2024
201 Medicare Part D claims for 147 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. 59 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen40 claims
- Doxycycline Hyclate18 claims
- Amoxicillin-Clavulanate Potass12 claims
- Tramadol Hcl12 claims
- Cephalexin11 claims
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): 94.6 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).
Richard Martin Grandquist among 3,376 medical physician assistant records in California
Richard Martin Grandquist, PA-C is one of 3,376 medical physician assistant records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 58% of them.
- NPI issued2014 · 58% of these records are older, 38% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · 40% of these records are
- Record last updated2014 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Physician Assistant providers in California
There are 3,376 medical physician assistant records in California.
All 3,376 in California → Every provider in Colton → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Kyla Agbayani, PA-CColton, CA 923241205598455
- Megan BuetiColton, CA 923241235534108
- Patrick Creasy, PAColton, CA 923241992000574
- Amy Dahlberg, PA-CColton, CA 923241023205275
- Ashley Glenn-McDowell, MS, PA-CColton, CA 923241063859783
- Marijo Goodsite, PAColton, CA 923241619229564
- Jesse Jacquez, P.A.-C.Colton, CA 923241285644294
- Hayden LeslieColton, CA 923241184248650
Common questions
What is Richard Martin Grandquist, PA-C's NPI number?
Richard Martin Grandquist, PA-C's National Provider Identifier (NPI) is 1578962049, issued on Aug 20, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Richard Martin Grandquist, PA-C located?
The NPPES record lists a practice address at 400 N Pepper Ave Ste 107, Colton, CA, 92324. Phone: (650) 996-8240. Providers update this record themselves, so call before visiting.
How can I verify Richard Martin Grandquist, PA-C's license?
NPPES lists California license number 51840, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Richard Martin Grandquist, PA-C prescribe under Medicare Part D?
In 2024, Richard Martin Grandquist, PA-C had 201 Medicare Part D claims for 147 beneficiaries; the average among medical physician assistant prescribers was 1,148. Part D covers Medicare prescriptions only.
What is Richard Martin Grandquist, PA-C's MIPS final score?
The 2023 MIPS final score is 94.6 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.