Stephen Penepacker, MD
NPI 1336165125 · Psychiatry Physician · San Luis Obispo, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Penepacker, MD is a Psychiatry Physician provider in San Luis Obispo, CA (NPI 1336165125).
Provider details
- NPI number
- 1336165125
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- C180768 (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
466 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 | 168 | $128 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 118 | $98 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 68 | $66 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 66 | $89 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 46 | $54 |
Typical Medicare-allowed amounts for these services range $54–$128 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 59 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Olanzapine | 310 | 55 |
| Clonazepam | 252 | 40 |
| Quetiapine Fumarate | 220 | 37 |
| Clozapine | 169 | 18 |
| Lamotrigine | 150 | 30 |
| Gabapentin | 140 | 29 |
| Paliperidone Palmitatebrand: Invega Sustenna | 138 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,226 across 66 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)
- 1350 E Grand AveArroyo Grande, CA 93420-2422Phone: (805) 474-2154Fax: (805) 474-2160
Registry dates
- Enumerated
- 2006-07-14
- Last updated
- 2025-12-09
- Certified
- 2025-12-09
Frequently asked questions
- What is Stephen Penepacker's NPI number?
- Stephen Penepacker's National Provider Identifier (NPI) is 1336165125, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Penepacker's specialty?
- Stephen Penepacker is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Penepacker located?
- Stephen Penepacker's practice location on file with NPPES is 2178 Johnson Ave, San Luis Obispo, CA 93401-4535.
- What is Stephen Penepacker's phone number?
- The practice phone number listed in the NPPES registry for Stephen Penepacker is (805) 781-4700.
- Does Stephen Penepacker accept Medicare?
- Stephen Penepacker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Penepacker's NPI active?
- Yes — Stephen Penepacker's NPI (1336165125) is active in the NPPES registry as of the last update on 2025-12-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.