Daniel Rengstorff, M.D.
NPI 1033295662 · Gastroenterology Physician · San Mateo, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel Rengstorff, M.D. is a Gastroenterology Physician provider in San Mateo, CA (NPI 1033295662).
Provider details
- NPI number
- 1033295662
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A75430 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
520 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 118 | $154 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 82 | $110 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 73 | $130 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 57 | $183 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 57 | $134 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 170 | 59 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 68 | 67 |
| Famotidine | 47 | 13 |
| Omeprazole | 45 | 18 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 34 | 34 |
| Lipase/Protease/Amylasebrand: Creon | 28 | — |
| Linaclotidebrand: Linzess |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$60 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 2900 Whipple Ave Ste 245Redwood City, CA 94062-2851Phone: (650) 365-3700Fax: (650) 368-3836
Registry dates
- Enumerated
- 2006-10-27
- Last updated
- 2024-10-07
- Certified
- 2024-10-07
Frequently asked questions
- What is Daniel Rengstorff's NPI number?
- Daniel Rengstorff's National Provider Identifier (NPI) is 1033295662, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel Rengstorff's specialty?
- Daniel Rengstorff is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel Rengstorff located?
- Daniel Rengstorff's practice location on file with NPPES is 218 De Anza Blvd, San Mateo, CA 94402-3913.
- What is Daniel Rengstorff's phone number?
- The practice phone number listed in the NPPES registry for Daniel Rengstorff is (650) 341-9131.
- Does Daniel Rengstorff accept Medicare?
- Daniel Rengstorff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Daniel Rengstorff's NPI active?
- Yes — Daniel Rengstorff's NPI (1033295662) is active in the NPPES registry as of the last update on 2024-10-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.