Jeffrey Hallazgo, M.D.
NPI 1073538302 · Internal Medicine Physician · Fenton, MO
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jeffrey Hallazgo, M.D. is a Internal Medicine Physician provider in Fenton, MO (NPI 1073538302).
Provider details
- NPI number
- 1073538302
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- R4G27 (MO)
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
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
401 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 | 245 | $120 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 119 | $124 |
| Administration of Influenza Virus VaccineG0008 | 37 | $31 |
Typical Medicare-allowed amounts for these services range $31–$124 (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 · 119 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 539 | 142 |
| Amlodipine Besylate | 387 | 115 |
| Losartan Potassium | 308 | 84 |
| Levothyroxine Sodium | 284 | 75 |
| Lisinopril | 237 | 63 |
| Simvastatin | 192 | 58 |
| Omeprazole | 167 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$336 across 18 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
Additional practice locations (1)
- 12680 Olive Blvd Ste 100Creve Coeur, MO 63141-6322Phone: (314) 251-8900Fax: (314) 251-8901
Registry dates
- Enumerated
- 2006-07-13
- Last updated
- 2021-05-10
- Certified
- 2021-05-10
Frequently asked questions
- What is Jeffrey Hallazgo's NPI number?
- Jeffrey Hallazgo's National Provider Identifier (NPI) is 1073538302, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jeffrey Hallazgo's specialty?
- Jeffrey Hallazgo is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jeffrey Hallazgo located?
- Jeffrey Hallazgo's practice location on file with NPPES is 714 Gravois Rd, Fenton, MO 63026-7723.
- What is Jeffrey Hallazgo's phone number?
- The practice phone number listed in the NPPES registry for Jeffrey Hallazgo is (636) 326-6100.
- Does Jeffrey Hallazgo accept Medicare?
- Jeffrey Hallazgo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jeffrey Hallazgo's NPI active?
- Yes — Jeffrey Hallazgo's NPI (1073538302) is active in the NPPES registry as of the last update on 2021-05-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.