John Calvin Jackson, MD
Family Medicine Physician · Grass Valley, CA
John Calvin Jackson, MD is a family medicine physician with a practice address in Grass Valley, California, and NPI 1487689840, issued on Jul 12, 2006. Check the license (California G37527, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Calvin Jackson
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G37527 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10565 Brunswick RD, Grass Valley, CA 95945
- Phone
- (530) 272-0501
- Enumerated
- Jul 12, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (530) 272-0571
- Medicare enrollment
- Enrolled (PECOS I20090923000716); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1977
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 10565 Brunswick RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jerald Leitherer, PTPhysical Therapist1912039058
Verify John Calvin Jackson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G37527Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 86% of the cost of the top drugs
192 Medicare Part D claims for 98 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 37% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Shingrix35 claims
- Boostrix Tdap17 claims
- Lisinopril11 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.
Bills Medicare through one group practice
- Sierra Medical PartnershipAuburn, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Calvin Jackson among 17,133 family medicine physician records in California
John Calvin Jackson, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1977 · median 2005 among the 10,652 with a school on file
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
36 family medicine physician records list a practice address in Grass Valley
They are 36 of the 1,540 NPPES records with a practice address in Grass Valley, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Grass Valley → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Garrett Eckerling, M.D.Grass Valley, CA 959451215937388
- Jill Fitzpatrick, MDGrass Valley, CA 959451689640658
- Linda Foshagen, DOGrass Valley, CA 959451568420750
- Constance Gaulter, M.D.Grass Valley, CA 959451508881459
- Byron Lake, M.D.Grass Valley, CA 959451891832242
- Frank Lang, M.D.Grass Valley, CA 959451417942939
- Veronica Minier, MDGrass Valley, CA 959451720050909
- Neva Monigatti Lake, MDGrass Valley, CA 959451265487383
Common questions
What is John Calvin Jackson, MD's NPI number?
John Calvin Jackson, MD's National Provider Identifier (NPI) is 1487689840, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Calvin Jackson, MD located?
The NPPES record lists a practice address at 10565 Brunswick RD, Grass Valley, CA, 95945. Phone: (530) 272-0501. Providers update this record themselves, so call before visiting.
How can I verify John Calvin Jackson, MD's license?
NPPES lists California license number G37527, 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 John Calvin Jackson, MD prescribe under Medicare Part D?
In 2024, John Calvin Jackson, MD had 192 Medicare Part D claims for 98 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.