Andrea Heyn, MD
NPI 1194159319 · Family Medicine Physician · Merced, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrea Heyn, MD is a Family Medicine Physician provider in Merced, CA (NPI 1194159319).
Provider details
- NPI number
- 1194159319
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A132106 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
7 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
131 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 | 84 | $131 |
| Hemoglobin A1c Level83036 | 25 | $10 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 22 | $93 |
Typical Medicare-allowed amounts for these services range $10–$131 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 83 | 25 |
| Losartan Potassium | 66 | 18 |
| Levothyroxine Sodium | 50 | 14 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 44 | 14 |
| Metoprolol Succinate | 41 | 12 |
| Lisinopril | 37 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$16 across 1 record (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
Additional practice locations (6)
- 2823 Fresno StFresno, CA 93721-1324Phone: (559) 459-6000Fax: (559) 459-6109
- 3940 Sandpiper AveMerced, CA 95340-8372Phone: (209) 722-4842
- 127 W El Portal DrMerced, CA 95348-2853Phone: (209) 723-3704Fax: (209) 723-0272
- 857 W Childs AveMerced, CA 95341-6862Phone: (209) 722-4842
- 374 W Olive Ave Ste BMerced, CA 95348-3181Phone: (209) 383-3076Fax: (209) 383-6301
- 372 W Cypress AveReedley, CA 93654-2113Phone: (559) 638-8155
Registry dates
- Enumerated
- 2013-08-23
- Last updated
- 2023-12-20
- Certified
- 2023-12-20
Frequently asked questions
- What is Andrea Heyn's NPI number?
- Andrea Heyn's National Provider Identifier (NPI) is 1194159319, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrea Heyn's specialty?
- Andrea Heyn is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Andrea Heyn located?
- Andrea Heyn's practice location on file with NPPES is 3349 G St Ste F, Merced, CA 95340-0978.
- What is Andrea Heyn's phone number?
- The practice phone number listed in the NPPES registry for Andrea Heyn is (209) 349-8459.
- Does Andrea Heyn accept Medicare?
- Andrea Heyn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrea Heyn's NPI active?
- Yes — Andrea Heyn's NPI (1194159319) is active in the NPPES registry as of the last update on 2023-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.