Irene Ritterman, R.N., N.P.
NPI 1336505247 · Family Nurse Practitioner · Palo Alto, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Irene Ritterman, R.N., N.P. is a Family Nurse Practitioner provider in Palo Alto, CA (NPI 1336505247).
Provider details
- NPI number
- 1336505247
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- R.N., N.P.
- Sex
- Female
- Sole proprietor
- No
- License
- 847527 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
66 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 33 | $131 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 21 | $93 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 12 | $168 |
Typical Medicare-allowed amounts for these services range $93–$168 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-01-07
- Last updated
- 2020-05-29
- Certified
- 2020-05-29
Frequently asked questions
- What is Irene Ritterman's NPI number?
- Irene Ritterman's National Provider Identifier (NPI) is 1336505247, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irene Ritterman's specialty?
- Irene Ritterman is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Irene Ritterman located?
- Irene Ritterman's practice location on file with NPPES is 795 El Camino Real, Palo Alto, CA 94301-2302.
- What is Irene Ritterman's phone number?
- The practice phone number listed in the NPPES registry for Irene Ritterman is (650) 853-2977.
- Does Irene Ritterman accept Medicare?
- Irene Ritterman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Irene Ritterman's NPI active?
- Yes — Irene Ritterman's NPI (1336505247) is active in the NPPES registry as of the last update on 2020-05-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.