Sara Hammer, DO
NPI 1144858457 · Family Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sara Hammer, DO is a Family Medicine Physician provider in Chicago, IL (NPI 1144858457).
Provider details
- NPI number
- 1144858457
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 036-164028 (IL)
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
6 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
154 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 | 43 | $129 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 34 | $182 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 31 | $9 |
| 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 | 19 | $17 |
| Hemoglobin A1c Level83036 | 15 | $10 |
| Assessment of Emotional Or Behavioral Problems |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 87 | 38 |
| Amlodipine Besylate | 64 | 32 |
| Lisinopril | 53 | 30 |
| Losartan Potassium | 37 | 13 |
| Levothyroxine Sodium | 36 | 18 |
| Metformin Hcl | 33 | 15 |
| Omeprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$24 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 (1)
- 836 W Wellington AveChicago, IL 60657-5147Phone: (773) 975-1600
Registry dates
- Enumerated
- 2020-03-31
- Last updated
- 2025-09-29
- Certified
- 2025-09-29
Frequently asked questions
- What is Sara Hammer's NPI number?
- Sara Hammer's National Provider Identifier (NPI) is 1144858457, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sara Hammer's specialty?
- Sara Hammer is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sara Hammer located?
- Sara Hammer's practice location on file with NPPES is 3936 N Milwaukee Ave, Chicago, IL 60641-2703.
- What is Sara Hammer's phone number?
- The practice phone number listed in the NPPES registry for Sara Hammer is (773) 736-6125.
- Does Sara Hammer accept Medicare?
- Sara Hammer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sara Hammer's NPI active?
- Yes — Sara Hammer's NPI (1144858457) is active in the NPPES registry as of the last update on 2025-09-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.