Mark Giesbrecht, M.D.
NPI 1366554560 · Psychiatry Physician · Bakersfield, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Giesbrecht, M.D. is a Psychiatry Physician provider in Bakersfield, CA (NPI 1366554560).
Provider details
- NPI number
- 1366554560
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A84165 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Clozapine | 60 |
| Bupropion Hclbrand: Bupropion Xl | 32 |
| Divalproex Sodiumbrand: Divalproex Sodium Er | 31 |
| Divalproex Sodium | 23 |
| Paliperidone Palmitatebrand: Invega Sustenna | 22 |
| Haloperidol | 21 |
| Olanzapine | 20 |
| Aripiprazole | 18 |
| Trazodone Hcl | 17 |
| Fluoxetine Hcl |
Practice location
Mailing address
Additional practice locations (1)
- 7335 N 1st StSuite 109Fresno, CA 93720-2968Phone: (559) 438-1199
Registry dates
- Enumerated
- 2006-09-01
- Last updated
- 2021-05-18
- Certified
- 2021-05-18
Frequently asked questions
- What is Mark Giesbrecht's NPI number?
- Mark Giesbrecht's National Provider Identifier (NPI) is 1366554560, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Giesbrecht's specialty?
- Mark Giesbrecht is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Giesbrecht located?
- Mark Giesbrecht's practice location on file with NPPES is 1600 E Belle Ter, Bakersfield, CA 93307-3871.
- What is Mark Giesbrecht's phone number?
- The practice phone number listed in the NPPES registry for Mark Giesbrecht is (661) 635-2950.
- Does Mark Giesbrecht accept Medicare?
- Mark Giesbrecht is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Giesbrecht's NPI active?
- Yes — Mark Giesbrecht's NPI (1366554560) is active in the NPPES registry as of the last update on 2021-05-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.