Mark Zeme, M. D.
NPI 1669400388 · Otolaryngology Physician · Castro Valley, CA
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Zeme, M. D. is a Otolaryngology Physician provider in Castro Valley, CA (NPI 1669400388).
Provider details
- NPI number
- 1669400388
- Entity type
- Individual
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M. D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G66448 (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
19 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
856 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) |
|---|---|---|
| Exam of Ear Using a Microscope92504 | 169 | $38 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 135 | $109 |
| Comprehensive Hearing Test92570 | 126 | $38 |
| Test for Hearing Various Pitches Using Earphone and Device Placed Against the Bone92553 | 104 | $64 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 104 | $133 |
| Diagnostic Exam of Nasal Passages Using an Endoscope31231 | 72 | $242 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Prednisone | 16 |
| Pantoprazole Sodium | 14 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-29
- Last updated
- 2014-03-04
Frequently asked questions
- What is Mark Zeme's NPI number?
- Mark Zeme's National Provider Identifier (NPI) is 1669400388, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Zeme's specialty?
- Mark Zeme is listed in the NPPES registry with a primary specialty of Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Zeme located?
- Mark Zeme's practice location on file with NPPES is 20400 Lake Chabot Rd Ste 301, Castro Valley, CA 94546-5316.
- What is Mark Zeme's phone number?
- The practice phone number listed in the NPPES registry for Mark Zeme is (510) 889-6673.
- Does Mark Zeme accept Medicare?
- Mark Zeme is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Zeme's NPI active?
- Yes — Mark Zeme's NPI (1669400388) is active in the NPPES registry as of the last update on 2014-03-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.