Mark Loewen, D.O.
NPI 1558625830 · Emergency Medicine Physician · Bakersfield, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Loewen, D.O. is a Emergency Medicine Physician provider in Bakersfield, CA (NPI 1558625830).
Provider details
- NPI number
- 1558625830
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 20A13155 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
366 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 192 | $186 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 62 | $129 |
| Critical Care, First 30-74 Minutes99291 | 56 | $232 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 23 | $76 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 22 | $208 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 11 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 40 | 39 |
| Doxycycline Hyclate | 35 | 33 |
| Ibuprofen | 34 | 34 |
| Methylprednisolone | 24 | 23 |
| Cephalexin | 20 | 20 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 20 | 20 |
| Ondansetronbrand: Ondansetron Odt | 19 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-07-01
- Last updated
- 2015-12-22
Frequently asked questions
- What is Mark Loewen's NPI number?
- Mark Loewen's National Provider Identifier (NPI) is 1558625830, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Loewen's specialty?
- Mark Loewen is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Loewen located?
- Mark Loewen's practice location on file with NPPES is 10717 Rising Sun Dr, Bakersfield, CA 93312-2924.
- What is Mark Loewen's phone number?
- The practice phone number listed in the NPPES registry for Mark Loewen is (661) 330-1857.
- Does Mark Loewen accept Medicare?
- Mark Loewen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Loewen's NPI active?
- Yes — Mark Loewen's NPI (1558625830) is active in the NPPES registry as of the last update on 2015-12-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.