Jethro Trees Ritter, D.O.
Infectious Disease Physician · San Luis Obispo, CA
Jethro Trees Ritter, D.O. is an infectious disease physician with a practice address in San Luis Obispo, California, and NPI 1457330797, issued on Jan 13, 2006. Check the license (California 20A8407, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jethro Trees Ritter
- Credential
- D.O.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 20A8407 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1551 Bishop St Ste 250, San Luis Obispo, CA 93401
- Phone
- (805) 540-0689
- Enumerated
- Jan 13, 2006
- Record last updated
- May 12, 2023
- Fax
- (805) 541-4376
- Medicare enrollment
- Enrolled (PECOS I20040512001340); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 1551 Bishop St Ste 250
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christopher Holland, M.D.Infectious Disease Physician1063492031
Verify Jethro Trees Ritter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A8407Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3% fewer Medicare Part D claims than the average infectious disease physician in 2024
667 Medicare Part D claims for 98 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Fluconazole74 claims
- Ampicillin-Sulbactam55 claims
- Cefazolin Sodium48 claims
- Ceftriaxone45 claims
- Ritonavir41 claims
- Atazanavir Sulfate36 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
- J Trees Ritter, DO, IncSan Luis Obispo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jethro Trees Ritter among 1,119 infectious disease physician records in California
Jethro Trees Ritter, D.O. is one of 1,119 infectious disease physician records with a practice address in California. 79% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2001 · median 2003 among the 735 with a school on file
- Record last updated2023 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in San Luis Obispo → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Gregory Canfield, M.D., PH.D.San Luis Obispo, CA 934011144632159
- Hayley ClevelandSan Luis Obispo, CA 934011811428998
- Christopher Holland, M.D.San Luis Obispo, CA 934011063492031
- Franco Felizarta, MDBakersfield, CA 933891629004957
- Richard Prier, M.D.Templeton, CA 934651962409110
- Shankar Raman, MD,MPHBakersfield, CA 933111013988807
- Anthony Milanes, M.D.Bakersfield, CA 933091740292036
- Randolph Senining, MDBakersfield, CA 933091841216405
Common questions
What is Jethro Trees Ritter, D.O.'s NPI number?
Jethro Trees Ritter, D.O.'s National Provider Identifier (NPI) is 1457330797, issued on Jan 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jethro Trees Ritter, D.O. located?
The NPPES record lists a practice address at 1551 Bishop St Ste 250, San Luis Obispo, CA, 93401. Phone: (805) 540-0689. Providers update this record themselves, so call before visiting.
How can I verify Jethro Trees Ritter, D.O.'s license?
NPPES lists California license number 20A8407, 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 Jethro Trees Ritter, D.O. prescribe under Medicare Part D?
In 2024, Jethro Trees Ritter, D.O. had 667 Medicare Part D claims for 98 beneficiaries; the average among infectious disease physician prescribers was 689. 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.