Michael Amster, MD
NPI 1114023058 · Pain Medicine Physician · Santa Cruz, CA
Enrolled with Medicare as Practitioner - Pain Management · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Amster, MD is a Pain Medicine Physician provider in Santa Cruz, CA (NPI 1114023058).
Provider details
- NPI number
- 1114023058
- Entity type
- Individual
- Primary specialty
- Pain Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- A81550 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tramadol Hcl | 43 | — |
| Oxycodone Hcl | 41 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 33 | 12 |
| Morphine Sulfatebrand: Morphine Sulfate Er | 32 | — |
| Duloxetine Hcl | 24 | — |
| Gabapentin | 19 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$168 across 5 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
Registry dates
- Enumerated
- 2006-09-16
- Last updated
- 2022-12-07
- Certified
- 2022-12-07
Frequently asked questions
- What is Michael Amster's NPI number?
- Michael Amster's National Provider Identifier (NPI) is 1114023058, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Amster's specialty?
- Michael Amster is listed in the NPPES registry with a primary specialty of Pain Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Amster located?
- Michael Amster's practice location on file with NPPES is 1510 Capitola Rd, Santa Cruz, CA 95062-2912.
- What is Michael Amster's phone number?
- The practice phone number listed in the NPPES registry for Michael Amster is (831) 427-3500.
- Does Michael Amster accept Medicare?
- Michael Amster is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Amster's NPI active?
- Yes — Michael Amster's NPI (1114023058) is active in the NPPES registry as of the last update on 2022-12-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.