NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1700845153 M.D.
Verify on CMS → Sefer Gezer, M.D.
Hematology (Internal Medicine) Physician in Chicago, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,436 in Hematology (Internal Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
550
Medicare Part D claims · 102 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Generic prescribing
39%
generic claims · 61% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Sefer Gezer, M.D. filed 550 Medicare Part D claims in 2023 as a Hematology (Internal Medicine) Physician in Chicago, Illinois, prescribing 39% generic.
- 550
- Part D claims, 2023
- 39%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Sefer Gezer, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
550 Top 34% higher than 66% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Sefer Gezer, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Sefer Gezer, M.D.?
Quality data not reportedPrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
550 21% vs specialty avg
Specialty distribution in Illinois
How Hematology (Internal Medicine) Physician compares to other specialties among Illinois providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Hematology (Internal Medicine) Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Sefer Gezer, M.D. appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding M.D. credentials at 1725 W HARRISON ST, Chicago, IL, 60612, with a listed phone of (312) 942-5904. NPI 1700845153 was issued on 03/22/2006.
Medicare Part D records for calendar year 2023 show 550 prescription claims written by this provider, covering 102 Medicare beneficiaries and totaling roughly $608K in drug spend, split 61% brand-name and 39% generic by claim count.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,436 enrolled providers across 50 states and an average of 693 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1700845153 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/22/2006 |
Hospital and facility affiliations
Facilities where Sefer Gezer, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Rush University Medical Group
Chicago, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Illinois IDFPR 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 - they are NOT specific to Sefer Gezer, M.D.. To verify Sefer Gezer, M.D.'s current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Brand-heavy
Sefer Gezer, M.D. - brand share 61.0%
Hematology (Internal Medicine) Physician average
61% brand-name claims vs 39% generic, on 550 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
550
Total Claims
$608K
Total Drug Cost
102
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 786
- Total Day Supply
- 23,340
- Brand vs Generic
- 61% brand / 39% generic
- Brand Drug Cost
- $587K
- Generic Drug Cost
- $22K
Patient Demographics
- Average Patient Age
- 68.2 years
- Avg HCC Risk Score
- 2.25
- Gender Split
- 63% female / 37% male
- Age Distribution
- <65: 30, 65-74: 38, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Sefer Gezer, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Eliquis
Eliquis
219 claims
- Warfarin Sodium
Warfarin Sodium
116 claims
- Xarelto
Xarelto
106 claims
- Enoxaparin Sodium 60
Enoxaparin Sodium
60 claims
- Hydroxyurea 13
Hydroxyurea
13 claims
- Promacta 12
Promacta
12 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 219 |
| Warfarin Sodium | 116 |
| Xarelto Rivaroxaban | 106 |
| Enoxaparin Sodium | 60 |
| Hydroxyurea | 13 |
| Promacta Eltrombopag Olamine | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in IL →
All providers in Illinois →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Sefer Gezer, M.D. fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,436
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Sefer Gezer, M.D.'s 550 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Gezer.
Dr. Rosalinda Aloran
M.D.
Elmwood Park, IL
Dr. Saad Arain
M.D.
Evanston, IL
Dr. Alyssa Ceilesh
D.O.
Rockford, IL
Dr. Fahrettin Covut
M.D.
Rockford, IL
Dr. Irene Dehghan-Paz
MD
Chicago, IL
Compare Hematology (Internal Medicine) Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Illinois medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology (Internal Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Sefer Gezer, M.D.'s specialty? ▼
Sefer Gezer, M.D. specializes in Hematology (Internal Medicine) Physician and practices in Chicago, Illinois. Credentials: M.D..
How much does Sefer Gezer, M.D. prescribe under Medicare Part D? ▼
In 2023, Sefer Gezer, M.D. wrote 550 Medicare Part D claims totaling $608K in drug costs for 102 beneficiaries.
Where is Sefer Gezer, M.D. located? ▼
Sefer Gezer, M.D. is located at 1725 W HARRISON ST, Chicago, IL, 60612. Phone: (312) 942-5904.
What is Sefer Gezer, M.D.'s NPI number? ▼
Sefer Gezer, M.D.'s National Provider Identifier (NPI) is 1700845153, issued on 03/22/2006.
Does Sefer Gezer, M.D. prescribe more brand-name or generic drugs? ▼
Sefer Gezer, M.D.'s prescribing is 61% brand-name and 39% generic drugs by claim count, with $587K in brand drug costs.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,436 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does Sefer Gezer, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Sefer Gezer, M.D.'s most frequently prescribed drugs include Eliquis, Warfarin Sodium, Xarelto. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Sefer Gezer, M.D. accept Medicare? ▼
Sefer Gezer, M.D. appears in CMS Medicare data with 550 Part D claims and 102 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Sefer Gezer, M.D.'s credentials? ▼
Sefer Gezer, M.D.'s NPI is 1700845153 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.