David Trefflich, MD
NPI 1861836942 · Internal Medicine Physician · Santa Maria, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Trefflich, MD is a Internal Medicine Physician provider in Santa Maria, CA (NPI 1861836942).
Provider details
- NPI number
- 1861836942
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A170337 (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
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
187 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) |
|---|---|---|
| Hemoglobin A1c Level83036 | 145 | $6 |
| X-Ray of Chest, 2 Views71046 | 31 | $27 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 11 | $7 |
Typical Medicare-allowed amounts for these services range $6–$27 (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 · 68 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 293 | 102 |
| Amlodipine Besylate | 233 | 70 |
| Lisinopril | 165 | 50 |
| Metformin Hcl | 136 | 47 |
| Omeprazole | 134 | 51 |
| Gabapentin | 123 | 54 |
| Tamsulosin Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$77 across 4 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
Registry dates
- Enumerated
- 2013-04-19
- Last updated
- 2020-10-28
- Certified
- 2020-10-23
Frequently asked questions
- What is David Trefflich's NPI number?
- David Trefflich's National Provider Identifier (NPI) is 1861836942, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Trefflich's specialty?
- David Trefflich is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is David Trefflich located?
- David Trefflich's practice location on file with NPPES is 430 S Blosser Rd, Santa Maria, CA 93458-4908.
- What is David Trefflich's phone number?
- The practice phone number listed in the NPPES registry for David Trefflich is (805) 361-8900.
- Does David Trefflich accept Medicare?
- David Trefflich is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Trefflich's NPI active?
- Yes — David Trefflich's NPI (1861836942) is active in the NPPES registry as of the last update on 2020-10-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.