Ethelwoldo Pascual Guerrero, MD
Internal Medicine Physician · Colusa, CA
Ethelwoldo Pascual Guerrero, MD is an internal medicine physician with a practice address in Colusa, California, and NPI 1235155318, issued on Jul 14, 2006. Check the license (California A61539, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ethelwoldo Pascual Guerrero
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A61539 CA
Self-reported in NPPES; status is on the state search - Practice location
- 151 E Webster St, Colusa, CA 95932
- Phone
- (530) 458-4250
- Enumerated
- Jul 14, 2006
- Record last updated
- Sep 23, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 00A6153900 CA
- Medicare enrollment
- Enrolled (PECOS I20050930000426); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Ethelwoldo Pascual Guerrero in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A61539Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.5 times the Medicare Part D claims of the average internal medicine physician in 2024
11,174 Medicare Part D claims for 631 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 528 claims were for opioids.
Most prescribed
- Atorvastatin Calcium826 claims
- Levothyroxine Sodium441 claims
- Amlodipine Besylate403 claims
- Losartan Potassium361 claims
- Hydrocodone-Acetaminophen316 claims
- Lisinopril308 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
- Regents OF The University OF CaliforniaSacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ethelwoldo Pascual Guerrero among 17,696 internal medicine physician records in California
Ethelwoldo Pascual Guerrero, MD is one of 17,696 internal medicine 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1992 · median 2004 among the 11,065 with a school on file
- Record last updated2011 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Internal Medicine Physician providers in California
There are 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Colusa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jeffrey Thomas, M.D.Chico, CA 959291174650691
- James Carter, MDChico, CA 959281699838094
- Jeffrey Carlson, D.O.Chico, CA 959261750642849
- Marytere Carrasquillo Navarro, MDChico, CA 959261851751408
- Erika ClarkChico, CA 959261083292015
- Barry Furst, MDChico, CA 959261295863462
- Joanna HrabiaChico, CA 959261063075448
- Mehrdad Karimi, M.D.Chico, CA 959261528694403
Common questions
What is Ethelwoldo Pascual Guerrero, MD's NPI number?
Ethelwoldo Pascual Guerrero, MD's National Provider Identifier (NPI) is 1235155318, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ethelwoldo Pascual Guerrero, MD located?
The NPPES record lists a practice address at 151 E Webster St, Colusa, CA, 95932. Phone: (530) 458-4250. Providers update this record themselves, so call before visiting.
How can I verify Ethelwoldo Pascual Guerrero, MD's license?
NPPES lists California license number A61539, 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 Ethelwoldo Pascual Guerrero, MD prescribe under Medicare Part D?
In 2024, Ethelwoldo Pascual Guerrero, MD had 11,174 Medicare Part D claims for 631 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.