Irene Michele Maria Ritterman, R.N., N.P.
Family Nurse Practitioner · Palo Alto, CA
Irene Michele Maria Ritterman, R.N., N.P. is a family nurse practitioner with a practice address in Palo Alto, California, and NPI 1336505247, issued on Jan 7, 2016. Check the license (California NP95002843, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Irene Michele Maria Ritterman
- Credential
- R.N., N.P.
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License numbers
- NP95002843 CA
847527 CA
Self-reported in NPPES; status is on the state search - Practice location
- 795 EL Camino Real, Palo Alto, CA 94301
- Phone
- (650) 853-2977
- Enumerated
- Jan 7, 2016
- Record last updated
- May 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170403001991); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 16,966 in California → Look up another NPI →
Also registered at 795 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Irene Michele Maria Ritterman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license NP95002843Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average family nurse practitioner in 2024
134 Medicare Part D claims for 64 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of 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
- Sutter Bay Medical FoundationPalo Alto, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Irene Michele Maria Ritterman among 16,966 family nurse practitioner records in California
Irene Michele Maria Ritterman, R.N., N.P. is one of 16,966 family nurse practitioner records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 35% of them.
- NPI issued2016 · 35% of these records are older, 60% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2015 · median 2019 among the 6,793 with a school on file
- Record last updated2020 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
147 family nurse practitioner records list a practice address in Palo Alto
They are 147 of the 7,617 NPPES records with a practice address in Palo Alto, and 16,966 family nurse practitioner records in California.
All 16,966 in California → Every provider in Palo Alto → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Kelly Beim, FNPPalo Alto, CA 943011043428501
- Amy Bennett, FNP-BCPalo Alto, CA 943011366884017
- Kimberly Butler, NPPalo Alto, CA 943011578647244
- Alice Dalizu, N.P.Palo Alto, CA 943011093989402
- Simy George, NPPalo Alto, CA 943011578942330
- Aihua Hu, NP-CPalo Alto, CA 943011265726426
- Rhonda Jones, FNPPalo Alto, CA 943011750532529
- Zuzana Likar, NP-CPalo Alto, CA 943011487087755
Common questions
What is Irene Michele Maria Ritterman, R.N., N.P.'s NPI number?
Irene Michele Maria Ritterman, R.N., N.P.'s National Provider Identifier (NPI) is 1336505247, issued on Jan 7, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Irene Michele Maria Ritterman, R.N., N.P. located?
The NPPES record lists a practice address at 795 EL Camino Real, Palo Alto, CA, 94301. Phone: (650) 853-2977. Providers update this record themselves, so call before visiting.
How can I verify Irene Michele Maria Ritterman, R.N., N.P.'s license?
NPPES lists California license number NP95002843, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Irene Michele Maria Ritterman, R.N., N.P. prescribe under Medicare Part D?
In 2024, Irene Michele Maria Ritterman, R.N., N.P. had 134 Medicare Part D claims for 64 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.