Mark Sierra, MD
NPI 1639381593 · Cardiovascular Disease Physician · West Branch, MI
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Sierra, MD is a Cardiovascular Disease Physician provider in West Branch, MI (NPI 1639381593).
Provider details
- NPI number
- 1639381593
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301086565 (MI)
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
852 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) |
|---|---|---|
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 309 | $68 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 210 | $8 |
| Exercise Or Drug-Induced Heart Stress Test With Electrocardiogram (ecg) With Review By Physician93018 | 191 | $14 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 66 | $8 |
| Ultrasound of Heart With Continuous Electrocardiogram (ecg) During Rest, Exercise And/Or Drug Induced Stress With Review and Report93351 | 22 | $79 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 594 | 207 |
| Isosorbide Mononitratebrand: Isosorbide Mononitrate Er | 393 | 128 |
| Atorvastatin Calcium | 374 | 118 |
| Apixabanbrand: Eliquis | 357 | 106 |
| Furosemide | 326 | 109 |
| Lisinopril | 313 | 99 |
| Rosuvastatin Calcium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$127 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
- 2007-05-04
- Last updated
- 2012-04-25
Frequently asked questions
- What is Mark Sierra's NPI number?
- Mark Sierra's National Provider Identifier (NPI) is 1639381593, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sierra's specialty?
- Mark Sierra is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sierra located?
- Mark Sierra's practice location on file with NPPES is 2431 S. M-30, West Branch, MI 48661-9312.
- What is Mark Sierra's phone number?
- The practice phone number listed in the NPPES registry for Mark Sierra is (989) 343-3264.
- Does Mark Sierra accept Medicare?
- Mark Sierra is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Sierra's NPI active?
- Yes — Mark Sierra's NPI (1639381593) is active in the NPPES registry as of the last update on 2012-04-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.