Michael Mostyn, M.D.
NPI 1235166059 · Internal Medicine Physician · Palm Desert, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Mostyn, M.D. is a Internal Medicine Physician provider in Palm Desert, CA (NPI 1235166059).
Provider details
- NPI number
- 1235166059
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A37252 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
307 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 154 | $130 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 35 | $93 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 32 | $54 |
| Annual Alcohol Misuse Screening, 5 to 15 MinutesG0442 | 29 | $19 |
| Advance Care Planning, First 30 Minutes99497 | 22 | $83 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 22 | $19 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 75 | 37 |
| Amlodipine Besylate | 52 | 20 |
| Lisinopril | 52 | 19 |
| Metformin Hcl | 40 | 21 |
| Levothyroxine Sodium | 30 | 17 |
| Tamsulosin Hcl | 24 | — |
| Furosemide | 24 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$352 across 3 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
- 2006-06-27
- Last updated
- 2012-01-25
Frequently asked questions
- What is Michael Mostyn's NPI number?
- Michael Mostyn's National Provider Identifier (NPI) is 1235166059, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Mostyn's specialty?
- Michael Mostyn is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Mostyn located?
- Michael Mostyn's practice location on file with NPPES is 74990 Country Club Dr, Palm Desert, CA 92260-1991.
- What is Michael Mostyn's phone number?
- The practice phone number listed in the NPPES registry for Michael Mostyn is (760) 341-8800.
- Does Michael Mostyn accept Medicare?
- Michael Mostyn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Mostyn's NPI active?
- Yes — Michael Mostyn's NPI (1235166059) is active in the NPPES registry as of the last update on 2012-01-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.