Karl Greer, MD
Family Medicine Physician · Rohnert Park, CA
Karl Greer, MD is a family medicine physician with a practice address in Rohnert Park, California, and NPI 1396010740, issued on Mar 19, 2012. Check the license (California A127109, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karl Greer
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A127109 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5900 State Farm Dr FL 2, Rohnert Park, CA 94928
- Phone
- (707) 559-7600
- Enumerated
- Mar 19, 2012
- Record last updated
- Feb 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (707) 559-7620
- Medicare enrollment
- Enrolled (PECOS I20151109000961); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical Branch At Galveston, 2012
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 5900 State Farm Dr FL 2
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Karl Greer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A127109Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% fewer Medicare Part D claims than the average family medicine physician in 2024
2,724 Medicare Part D claims for 211 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 133 claims were for opioids.
Most prescribed
- Atorvastatin Calcium122 claims
- Losartan Potassium98 claims
- Amlodipine Besylate86 claims
- Gabapentin65 claims
- Trazodone Hcl63 claims
- Levothyroxine Sodium58 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 4 group practices
- Coastal Health AlliancePoint Reyes Station, CA
- Petaluma Health Center IncRohnert Park, CA
- Providence Medical FoundationPetaluma, CA
- Sutter Bay Medical FoundationSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karl Greer among 17,133 family medicine physician records in California
Karl Greer, 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 2012, is newer than 66% of them.
- NPI issued2012 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2012 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 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).
33 family medicine physician records list a practice address in Rohnert Park
They are 33 of the 483 NPPES records with a practice address in Rohnert Park, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Rohnert Park → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Margo Budman, MDRohnert Park, CA 949281710949821
- Charles Catlett, MDRohnert Park, CA 949281588748651
- Christopher Crossland, MDRohnert Park, CA 949281447334438
- Mary Frank, M.D.Rohnert Park, CA 949281174536023
- Robert Goodman, MDRohnert Park, CA 949281982666855
- Rex Harner, M.D.Rohnert Park, CA 949281528066321
- Judith Heiler, M.D.Rohnert Park, CA 949281346354420
- Steven Levenberg, DORohnert Park, CA 949281952350381
Common questions
What is Karl Greer, MD's NPI number?
Karl Greer, MD's National Provider Identifier (NPI) is 1396010740, issued on Mar 19, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Karl Greer, MD located?
The NPPES record lists a practice address at 5900 State Farm Dr FL 2, Rohnert Park, CA, 94928. Phone: (707) 559-7600. Providers update this record themselves, so call before visiting.
How can I verify Karl Greer, MD's license?
NPPES lists California license number A127109, 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 Karl Greer, MD prescribe under Medicare Part D?
In 2024, Karl Greer, MD had 2,724 Medicare Part D claims for 211 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.