Karen L. Fields, MD
Internal Medicine Physician · Camarillo, CA
Karen L. Fields, MD is an internal medicine physician with a practice address in Camarillo, California, and NPI 1497779656, issued on Jul 27, 2006. Check the license (California A45315, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen L. Fields
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A45315 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1601 Carmen Dr Ste 106, Camarillo, CA 93010
- Phone
- (818) 788-3308
- Enumerated
- Jul 27, 2006
- Record last updated
- Sep 14, 2023
- Fax
- (805) 389-8188
- Medicare enrollment
- Enrolled (PECOS I20071011000374); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1601 Carmen Dr Ste 106
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Liz Gahit, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1861372682
- Michael TakagiPsychiatric/Mental Health Nurse Practitioner1679447726
Verify Karen L. Fields in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A45315Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,095 Medicare Part D claims for 85 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 41 claims were for opioids.
Most prescribed
- Atorvastatin Calcium77 claims
- Gabapentin47 claims
- Amlodipine Besylate37 claims
- Metoprolol Succinate33 claims
- Eliquis29 claims
- Pantoprazole Sodium27 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.
Karen L. Fields among 17,696 internal medicine physician records in California
Karen L. Fields, 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
- Graduated1984 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 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).
26 internal medicine physician records list a practice address in Camarillo
They are 26 of the 2,656 NPPES records with a practice address in Camarillo, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Camarillo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jeffrey Allan, MDCamarillo, CA 930101407870652
- Afrouz Gerayli, MDCamarillo, CA 930101801044839
- Christopher Hynum, M.D.Camarillo, CA 930101588722573
- Ragaa Ibrahim, M.D.Camarillo, CA 930101730128364
- Gary Lieb, M.D.Camarillo, CA 930101912935396
- Bennet Lipper, MDCamarillo, CA 930101235129420
- Paul Morin, M.D.Camarillo, CA 930101932148525
- Elizabeth Nguyen, MDCamarillo, CA 930101770528028
Common questions
What is Karen L. Fields, MD's NPI number?
Karen L. Fields, MD's National Provider Identifier (NPI) is 1497779656, issued on Jul 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen L. Fields, MD located?
The NPPES record lists a practice address at 1601 Carmen Dr Ste 106, Camarillo, CA, 93010. Phone: (818) 788-3308. Providers update this record themselves, so call before visiting.
How can I verify Karen L. Fields, MD's license?
NPPES lists California license number A45315, 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 Karen L. Fields, MD prescribe under Medicare Part D?
In 2024, Karen L. Fields, MD had 1,095 Medicare Part D claims for 85 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.