Stefanie Altmann, DO
NPI 1912494188 · Internal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stefanie Altmann, DO is a Internal Medicine Physician provider in Walnut Creek, CA (NPI 1912494188).
Provider details
- NPI number
- 1912494188
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- Yes
- License
- OS18824 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
4,318 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) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 1,066 | $7 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 378 | $132 |
| Removal and Microscopic Exam of Growth of Head, Neck, Hands, Feet, Or Genitals, 1-5 Tissue Blocks17311 | 339 | $608 |
| Biopsy of Related Skin Growth, First Growth11102 | 328 | $89 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 296 | $50 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 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 |
|---|---|---|
| Mupirocin | 264 | 235 |
| Triamcinolone Acetonide | 150 | 108 |
| Gentamicin Sulfate | 143 | 116 |
| Doxycycline Hyclate | 113 | 97 |
| Ketoconazole | 81 | 58 |
| Doxycycline Monohydrate | 55 | 51 |
| Cephalexin | 51 | 49 |
| Clobetasol Propionate | 49 | 25 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$763 across 28 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 (3)
- 5575 W Las Positas Blvd Ste 230Pleasanton, CA 94588-5802Phone: (925) 416-1122Fax: (925) 416-2291
- 82883 Overseas HighwayIslamorada, FL 33036Phone: (305) 664-8898
- 1010 Kennedy Dr Ste 304Key West, FL 33040-4133Phone: (305) 296-3334
Registry dates
- Enumerated
- 2018-04-13
- Last updated
- 2026-05-07
- Certified
- 2026-05-07
Frequently asked questions
- What is Stefanie Altmann's NPI number?
- Stefanie Altmann's National Provider Identifier (NPI) is 1912494188, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stefanie Altmann's specialty?
- Stefanie Altmann is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stefanie Altmann located?
- Stefanie Altmann's practice location on file with NPPES is 100 Pringle Ave Ste 425, Walnut Creek, CA 94596-7385.
- What is Stefanie Altmann's phone number?
- The practice phone number listed in the NPPES registry for Stefanie Altmann is (925) 932-3800.
- Does Stefanie Altmann accept Medicare?
- Stefanie Altmann is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stefanie Altmann's NPI active?
- Yes — Stefanie Altmann's NPI (1912494188) is active in the NPPES registry as of the last update on 2026-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.