Dale Ritzo, M.D.
NPI 1255499323 · Internal Medicine Physician · San Mateo, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dale Ritzo, M.D. is a Internal Medicine Physician provider in San Mateo, CA (NPI 1255499323).
Provider details
- NPI number
- 1255499323
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G50169 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
908 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 415 | $101 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 228 | $140 |
| Administration of Influenza Virus VaccineG0008 | 78 | $24 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 62 | $141 |
| Residence Visit for Established Patient With Low Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99348 | 43 | $81 |
| Physician Or Allowed Practitioner Re-Certification for Medicare-Covered Home Health Services Under a Home Health Plan of Care (patient Not Present), Including Contacts With Home Health Agency and Review of Reports of Patient Status Required By Physicians a |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 70 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 261 | 66 |
| Rosuvastatin Calcium | 231 | 65 |
| Amlodipine Besylate | 213 | 59 |
| Atorvastatin Calcium | 205 | 60 |
| Lorazepam | 163 | 36 |
| Zolpidem Tartrate | 104 | 18 |
| Simvastatin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-04
- Last updated
- 2011-06-28
Frequently asked questions
- What is Dale Ritzo's NPI number?
- Dale Ritzo's National Provider Identifier (NPI) is 1255499323, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dale Ritzo's specialty?
- Dale Ritzo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Dale Ritzo located?
- Dale Ritzo's practice location on file with NPPES is 101 S San Mateo Dr, San Mateo, CA 94401-3819.
- What is Dale Ritzo's phone number?
- The practice phone number listed in the NPPES registry for Dale Ritzo is (650) 343-4003.
- Does Dale Ritzo accept Medicare?
- Dale Ritzo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dale Ritzo's NPI active?
- Yes — Dale Ritzo's NPI (1255499323) is active in the NPPES registry as of the last update on 2011-06-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.