Joanna Diel-Martin, NP
Nurse Practitioner · Petaluma, CA
Joanna Diel-Martin, NP is a nurse practitioner with a practice address in Petaluma, California, and NPI 1932759461, issued on Sep 17, 2019. Check the license (California 95012708, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Joanna Diel-Martin
- Credential
- NP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 95012708 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1179 N Mcdowell Blvd, Petaluma, CA 94954
- Phone
- (707) 559-7500
- Enumerated
- Sep 17, 2019
- Record last updated
- May 22, 2026
- Fax
- (707) 559-7620
- Medicare enrollment
- Enrolled (PECOS I20260506002212); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 8,223 in California → Look up another NPI →
Also registered at 1179 N Mcdowell Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joanna Diel-Martin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 95012708Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average nurse practitioner in 2024
886 Medicare Part D claims for 173 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 17 claims were for opioids.
Most prescribed
- Atorvastatin Calcium59 claims
- Metformin Hcl47 claims
- Levothyroxine Sodium38 claims
- Gabapentin30 claims
- Losartan Potassium25 claims
- Fluticasone Propionate24 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 2 group practices
- Coastal Health AlliancePoint Reyes Station, CA
- Petaluma Health Center IncPetaluma, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joanna Diel-Martin among 8,223 nurse practitioner records in California
Joanna Diel-Martin, NP is one of 8,223 nurse practitioner records with a practice address in California. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 61% of them.
- NPI issued2019 · 61% of these records are older, 34% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 42% of these records are
- Graduated2019 · median 2017 among the 3,425 with a school on file
- Record last updated2026 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nurse Practitioner providers in California
There are 8,223 nurse practitioner records in California.
All 8,223 in California → Every provider in Petaluma → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Lisa Carlson, RNPetaluma, CA 949541972458081
- Andrew Chinnock, FNPPetaluma, CA 949541174844674
- Patricia Grinnell, NPPetaluma, CA 949541538186457
- Colette Long, NPPetaluma, CA 949541588214019
- Lynne Palma, ARNPPetaluma, CA 949541306285697
- Sean Upton, RNPetaluma, CA 949541205162450
- Kathryn BryantPetaluma, CA 949521811397177
- Halle Ostman, RNPoint Reyes Station, CA 949561275345449
Common questions
What is Joanna Diel-Martin, NP's NPI number?
Joanna Diel-Martin, NP's National Provider Identifier (NPI) is 1932759461, issued on Sep 17, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Joanna Diel-Martin, NP located?
The NPPES record lists a practice address at 1179 N Mcdowell Blvd, Petaluma, CA, 94954. Phone: (707) 559-7500. Providers update this record themselves, so call before visiting.
How can I verify Joanna Diel-Martin, NP's license?
NPPES lists California license number 95012708, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Joanna Diel-Martin, NP prescribe under Medicare Part D?
In 2024, Joanna Diel-Martin, NP had 886 Medicare Part D claims for 173 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.