Karl Knudsen Johsens, M.D.
Internal Medicine Physician · Santa Cruz, CA
Karl Knudsen Johsens, M.D. is an internal medicine physician with a practice address in Santa Cruz, California, and NPI 1295948727, issued on May 8, 2007. Check the license (California G84030, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karl Knudsen Johsens
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- G84030 CA
G084030 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1595 Soquel Dr Ste 340, Santa Cruz, CA 95065
- Phone
- (831) 425-1279
- Enumerated
- May 8, 2007
- Record last updated
- Jul 11, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (831) 425-3500
- Medicaid ID
- 00G840300 CA
- Medicare enrollment
- Enrolled (PECOS I20100806000529); accepts Medicare assignment
- Medical or professional school
- University Of Hawaii John A. Burns School Of Medicine, 1993
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Karl Knudsen Johsens in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G84030Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% more Medicare Part D claims than the average internal medicine physician in 2024
4,310 Medicare Part D claims for 235 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 214 claims were for opioids.
Most prescribed
- Atorvastatin Calcium228 claims
- Rosuvastatin Calcium190 claims
- Losartan Potassium112 claims
- Amlodipine Besylate110 claims
- Omeprazole108 claims
- Metoprolol Succinate101 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.
The MIPS final score for 2023 (Medicare payment program): 75 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Karl Knudsen Johsens among 17,696 internal medicine physician records in California
Karl Knudsen Johsens, M.D. 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1993 · median 2004 among the 11,065 with a school on file
- Record last updated2019 · 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 Santa Cruz → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Elizabeth Brennan, M.D.Santa Cruz, CA 950651982794855
- Satish Chandra, M.D.Santa Cruz, CA 950651659474542
- Morvarid Ebrahimi, M.D.Santa Cruz, CA 950651366771727
- James Engelman, M.D.Santa Cruz, CA 950651518963982
- David Hayward, M.D.Santa Cruz, CA 950651447368576
- Delroy McFarlane, M.D.Santa Cruz, CA 950651619089588
- Vidya Nagaraju, M.D.Santa Cruz, CA 950651790806081
- Inemesit Newsome, MDSanta Cruz, CA 950651639494933
Common questions
What is Karl Knudsen Johsens, M.D.'s NPI number?
Karl Knudsen Johsens, M.D.'s National Provider Identifier (NPI) is 1295948727, issued on May 8, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karl Knudsen Johsens, M.D. located?
The NPPES record lists a practice address at 1595 Soquel Dr Ste 340, Santa Cruz, CA, 95065. Phone: (831) 425-1279. Providers update this record themselves, so call before visiting.
How can I verify Karl Knudsen Johsens, M.D.'s license?
NPPES lists California license number G84030, 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 Knudsen Johsens, M.D. prescribe under Medicare Part D?
In 2024, Karl Knudsen Johsens, M.D. had 4,310 Medicare Part D claims for 235 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Karl Knudsen Johsens, M.D.'s MIPS final score?
The 2023 MIPS final score is 75 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.