Stephen Hammack, MD
NPI 1639396393 · Family Medicine Physician · Flowood, MS
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Hammack, MD is a Family Medicine Physician provider in Flowood, MS (NPI 1639396393).
Provider details
- NPI number
- 1639396393
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 19226 (MS)
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
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,331 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 | 252 | $116 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 203 | $15 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 154 | $9 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 135 | $82 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 116 | $8 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 114 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 208 | 60 |
| Amlodipine Besylate | 152 | 44 |
| Pantoprazole Sodium | 136 | 39 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 132 | 20 |
| Meloxicam | 123 | 30 |
| Gabapentin | 120 | 32 |
| Furosemide |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,385 across 73 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 (2)
- 332 Highway 12 WestKosciusko, MS 39090Phone: (662) 289-1800Fax: (662) 289-2486
- 286 Calhoun Station PkwyMadison, MS 39110-5537Phone: (601) 200-4321Fax: (601) 859-0159
Registry dates
- Enumerated
- 2007-04-20
- Last updated
- 2023-06-12
- Certified
- 2021-05-28
Frequently asked questions
- What is Stephen Hammack's NPI number?
- Stephen Hammack's National Provider Identifier (NPI) is 1639396393, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Hammack's specialty?
- Stephen Hammack is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Hammack located?
- Stephen Hammack's practice location on file with NPPES is 294 E Layfair Dr, Flowood, MS 39232-9526.
- What is Stephen Hammack's phone number?
- The practice phone number listed in the NPPES registry for Stephen Hammack is (601) 414-6520.
- Does Stephen Hammack accept Medicare?
- Stephen Hammack is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Hammack's NPI active?
- Yes — Stephen Hammack's NPI (1639396393) is active in the NPPES registry as of the last update on 2023-06-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.