Michael Arnstein, M.D.
NPI 1821000100 · Specialist · Torrance, CA
Enrolled with Medicare as Practitioner - Plastic and Reconstructive Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Arnstein, M.D. is a Specialist provider in Torrance, CA (NPI 1821000100).
Provider details
- NPI number
- 1821000100
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G80314 (CA)
Specialties & taxonomies
Other Service Providers
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,460 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 401 | $68 |
| Complicated Repair of Wound of Scalp, Arms, Or Legs, 2.6-7.5 Cm13121 | 155 | $443 |
| Removal of Cancer Skin Growth of Face, Ears, Eyelids, Nose, Lips, Or Mouth, 1.1-2.0 Cm11642 | 136 | $148 |
| Complicated Repair of Wound of Forehead, Cheeks, Chin, Mouth, Neck, Underarms, Genitals, Hands, Or Feet, 2.6-7.5 Cm13132 | 132 | $498 |
| Removal of Skin and Tissue, 20.0 Sq Cm Or Less11042 | 102 | $63 |
| Removal of Cancer Skin Growth of Body, Arms, Or Legs, 1.1-2.0 Cm11602 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 30 | 18 |
| Mupirocin | 23 | 16 |
| Doxycycline Hyclate | 13 | 12 |
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,230 across 61 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
- 2006-08-13
- Last updated
- 2007-07-08
Frequently asked questions
- What is Michael Arnstein's NPI number?
- Michael Arnstein's National Provider Identifier (NPI) is 1821000100, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Arnstein's specialty?
- Michael Arnstein is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Michael Arnstein located?
- Michael Arnstein's practice location on file with NPPES is 22930 Crenshaw Blvd Ste D, Torrance, CA 90505-3048.
- What is Michael Arnstein's phone number?
- The practice phone number listed in the NPPES registry for Michael Arnstein is (310) 530-4200.
- Does Michael Arnstein accept Medicare?
- Michael Arnstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Arnstein's NPI active?
- Yes — Michael Arnstein's NPI (1821000100) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.