Matthew Welzenbach, MD
NPI 1386006088 · Internal Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Welzenbach, MD is a Internal Medicine Physician provider in Los Angeles, CA (NPI 1386006088).
Provider details
- NPI number
- 1386006088
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
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
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
13 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 | 13 | $129 |
Typical Medicare-allowed amounts for these services range $129–$129 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 90 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 558 | 246 |
| Amlodipine Besylate | 436 | 172 |
| Losartan Potassium | 350 | 132 |
| Lisinopril | 337 | 137 |
| Metformin Hcl | 316 | 120 |
| Rosuvastatin Calcium | 192 | 84 |
| Glipizide | 186 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-03-22
- Last updated
- 2023-01-19
Frequently asked questions
- What is Matthew Welzenbach's NPI number?
- Matthew Welzenbach's National Provider Identifier (NPI) is 1386006088, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Welzenbach's specialty?
- Matthew Welzenbach is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Welzenbach located?
- Matthew Welzenbach's practice location on file with NPPES is St. John'S Well Child, Los Angeles, CA 90007.
- What is Matthew Welzenbach's phone number?
- The practice phone number listed in the NPPES registry for Matthew Welzenbach is (213) 749-0947.
- Does Matthew Welzenbach accept Medicare?
- Matthew Welzenbach is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Welzenbach's NPI active?
- Yes — Matthew Welzenbach's NPI (1386006088) is active in the NPPES registry as of the last update on 2023-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.