Karl Joshua Nimtz
Emergency Medicine Physician · Walnut Creek, CA
Karl Joshua Nimtz is an emergency medicine physician with a practice address in Walnut Creek, California, and NPI 1417535600, issued on Mar 30, 2021. Check the license (California A192169, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karl Joshua Nimtz
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A192169 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1425 S Main St, Walnut Creek, CA 94596
- Phone
- (925) 295-4000
- Enumerated
- Mar 30, 2021
- Record last updated
- Aug 29, 2024
- Medicare enrollment
- Enrolled (PECOS I20241022004008); accepts Medicare assignment
- Medical or professional school
- Jefferson Medical College Of Thomas Jefferson University, 2021
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1425 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Peter Ackerman, MDEmergency Medicine Physician1427435023
- Aaron Mark Acosta, DOEmergency Medicine Physician1538789987
- Basil Adad, MDOtolaryngology Physician1487732574
- Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804
Verify Karl Joshua Nimtz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A192169Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
52% fewer Medicare Part D claims than the average emergency medicine physician in 2024
108 Medicare Part D claims for 79 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass12 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
- Permanente Medical Group IncWalnut Creek, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karl Joshua Nimtz among 7,751 emergency medicine physician records in California
Karl Joshua Nimtz is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 92% of them.
- NPI issued2021 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2021 · median 2011 among the 4,560 with a school on file
- Record last updated2024 · 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 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
95 emergency medicine physician records list a practice address in Walnut Creek
They are 95 of the 6,170 NPPES records with a practice address in Walnut Creek, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Walnut Creek → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Peter Barnett, M.D.Walnut Creek, CA 945961699882589
- Brian Baskin, MDWalnut Creek, CA 945961770554693
- Peter Benson, M.D.Walnut Creek, CA 945961487680393
- Scott Chamberlain, M.D.Walnut Creek, CA 945961356395453
- Charles Hansen, MDWalnut Creek, CA 945961891873956
- Christopher Jaksa, MDWalnut Creek, CA 945961619055779
- Conrad Lai, M.DWalnut Creek, CA 945961942248141
- Hannon Patel, MDWalnut Creek, CA 945961336227495
Common questions
What is Karl Joshua Nimtz's NPI number?
Karl Joshua Nimtz's National Provider Identifier (NPI) is 1417535600, issued on Mar 30, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Karl Joshua Nimtz located?
The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (925) 295-4000. Providers update this record themselves, so call before visiting.
How can I verify Karl Joshua Nimtz's license?
NPPES lists California license number A192169, 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 Joshua Nimtz prescribe under Medicare Part D?
In 2024, Karl Joshua Nimtz had 108 Medicare Part D claims for 79 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.