Karen D. Lockwood, MD
Internal Medicine Physician · Ventura, CA
Karen D. Lockwood, MD is an internal medicine physician with a practice address in Ventura, California, and NPI 1558330399, issued on Mar 15, 2006. Check the license (California 133833, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen D. Lockwood
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 133833 CA
4301077787 MI
Self-reported in NPPES; status is on the state search - Practice location
- 888 S Hill RD, Ventura, CA 93003
- Phone
- (888) 515-3500
- Enumerated
- Mar 15, 2006
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150615001088); accepts Medicare assignment
- Medical or professional school
- University Of Oklahoma College Of Medicine, 2001
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 888 S Hill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charles Adams, M.D.Family Medicine Physician1811925225
- Erin Anderson, P.T.Physical Therapist1811916299
- Nathania BarriosPharmacist1346827763
- Charles Brenner, M.D.Orthopaedic Surgery Physician1548299035
- Eric Chun, M.D.Family Medicine Physician1699702381
- Megan Chynoweth, PHARM.D.Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1689980260
Verify Karen D. Lockwood in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 133833Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12% more Medicare Part D claims than the average internal medicine physician in 2024
3,545 Medicare Part D claims for 386 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 132 claims were for opioids.
Most prescribed
- Atorvastatin Calcium287 claims
- Rosuvastatin Calcium173 claims
- Amlodipine Besylate159 claims
- Levothyroxine Sodium158 claims
- Lisinopril134 claims
- Losartan Potassium120 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
- Southern California Permanente Medical GroupWoodland Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen D. Lockwood among 17,696 internal medicine physician records in California
Karen D. Lockwood, 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
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
68 internal medicine physician records list a practice address in Ventura
They are 68 of the 4,435 NPPES records with a practice address in Ventura, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Ventura → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Deborah Carlson, M.D.Ventura, CA 930031942231121
- James Estes, M.D.Ventura, CA 930031336176098
- Doina Galiatzatos, M.D.Ventura, CA 930031548206089
- Scott Goodfriend, M.D.Ventura, CA 930031982636965
- Arthur Inoshita, MDVentura, CA 930031932105277
- Albert Kam, M.D.Ventura, CA 930031114953593
- James Mitchell, MDVentura, CA 930031598705485
- Charles Pankratz, M.D.Ventura, CA 930031689610511
Common questions
What is Karen D. Lockwood, MD's NPI number?
Karen D. Lockwood, MD's National Provider Identifier (NPI) is 1558330399, issued on Mar 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen D. Lockwood, MD located?
The NPPES record lists a practice address at 888 S Hill RD, Ventura, CA, 93003. Phone: (888) 515-3500. Providers update this record themselves, so call before visiting.
How can I verify Karen D. Lockwood, MD's license?
NPPES lists California license number 133833, 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 D. Lockwood, MD prescribe under Medicare Part D?
In 2024, Karen D. Lockwood, MD had 3,545 Medicare Part D claims for 386 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.