NPI registry status
Active
2026 NPPES data Medical Oncology Physician NPI 1316023278 MD
Verify on CMS → Gregory Kalemkerian, MD
Medical Oncology Physician in Ann Arbor, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,815 in Medical Oncology 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
386
Medicare Part D claims · 94 beneficiaries · Medical Oncology Physician avg: 689
Generic prescribing
73%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Gregory Kalemkerian, MD filed 386 Medicare Part D claims in 2023 as a Medical Oncology Physician in Ann Arbor, Michigan, prescribing 73% generic.
- 386
- Part D claims, 2023
- 73%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥57th
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1316023278 · Medical Oncology Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1316023278
- ENUM-LEGACY 2006
- TAX-NARROW 3,815
- RX-LIGHT 386
- BOOK-THIN 87 in Michigan
- PHOTO-ENUM Hagop Kantarjian · 2006
Gregory Kalemkerian, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
386 ≥ 57th percentile 57% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Gregory Kalemkerian, MD 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 Gregory Kalemkerian, MD?
Quality data not reportedPrimary specialty
Medical Oncology Physician
Medicare Part D claims
386 44% vs specialty avg
Specialty distribution in Michigan
How Medical Oncology Physician compares to other specialties among Michigan 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 Medical Oncology 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).
Practice Address
Provider Details
| NPI | 1316023278 |
|---|---|
| Specialty | Medical Oncology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 10/31/2006 |
Hospital and facility affiliations
Facilities where Gregory Kalemkerian, MD 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.
Regents OF The University OF Michigan
Ann Arbor, MI
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 - Michigan MI-BOM 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 ~41K Michigan medical licensees in 2023 - they are NOT specific to Gregory Kalemkerian, MD. To verify Gregory Kalemkerian, MD's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM 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 Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Gregory Kalemkerian, MD - brand share 27.0%
Medical Oncology Physician average
27% brand-name claims vs 73% generic, on 386 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.
386
Total Claims
$1.1M
Total Drug Cost
94
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 570
- Total Day Supply
- 14,987
- Brand vs Generic
- 27% brand / 73% generic
- Brand Drug Cost
- $1.1M
- Generic Drug Cost
- $12K
- Opioid Claims
- 47 (12.2% rate)
- Antibiotic Claims
- 11
Patient Demographics
- Average Patient Age
- 71.1 years
- Avg HCC Risk Score
- 2.80
- Gender Split
- 60% female / 40% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Kalemkerian, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Oxycodone Hcl
Oxycodone Hcl
37 claims
- Ondansetron Hcl
Ondansetron Hcl
34 claims
- Tagrisso
Tagrisso
31 claims
- Prednisone
Prednisone
27 claims
- Dexamethasone
Dexamethasone
16 claims
- Prochlorperazine M…
Prochlorperazine Maleate
15 claims
- Enoxaparin Sodium 14
Enoxaparin Sodium
14 claims
- Levothyroxine Sodium 14
Levothyroxine Sodium
14 claims
| Drug | Claims |
|---|---|
| Oxycodone Hcl | 37 |
| Ondansetron Hcl | 34 |
| Tagrisso Osimertinib Mesylate | 31 |
| Prednisone | 27 |
| Dexamethasone | 16 |
| Prochlorperazine Maleate | 15 |
| Enoxaparin Sodium | 14 |
| Levothyroxine Sodium | 14 |
| Escitalopram Oxalate | 11 |
| Rozlytrek Entrectinib | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Oncology Physician Overview
How Gregory Kalemkerian, MD fits within the Medical Oncology Physician landscape nationally.
3,815
Medical Oncology Physician Providers in US
53
States with Medical Oncology Physician
689
Avg Claims per Provider
Gregory Kalemkerian, MD's 386 claims are below the specialty average of 689.
Nationwide Medical Oncology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Kalemkerian, both outside Michigan so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Medical Oncology Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Kalemkerian.
One of 87 Medical Oncology Physician providers enrolled in Michigan, 5 are shown here.
Dr. Eugene Agnone
M.D.
Roseville, MI
Dr. Muhammad Ahmed
M.D.
Three Rivers, MI
Dr. Adil Akhtar
M.D.
Sterling Heights, MI
Dr. Ayham Al Ashkar
MD
Royal Oak, MI
Dr. Kathryn Alguire
M.D.
Norton Shores, MI
Compare Medical Oncology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Gregory Kalemkerian, MD's specialty? ▼
Gregory Kalemkerian, MD specializes in Medical Oncology Physician and practices in Ann Arbor, Michigan. Credentials: MD.
How much does Gregory Kalemkerian, MD prescribe under Medicare Part D? ▼
In 2023, Gregory Kalemkerian, MD wrote 386 Medicare Part D claims totaling $1.1M in drug costs for 94 beneficiaries.
Where is Gregory Kalemkerian, MD located? ▼
Gregory Kalemkerian, MD is located at 1500 E MEDICAL CENTER DR, Ann Arbor, MI, 48109. Phone: (734) 936-4000.
What is Gregory Kalemkerian, MD's NPI number? ▼
Gregory Kalemkerian, MD's National Provider Identifier (NPI) is 1316023278, issued on 10/31/2006.
Does Gregory Kalemkerian, MD prescribe more brand-name or generic drugs? ▼
Gregory Kalemkerian, MD's prescribing is 27% brand-name and 73% generic drugs by claim count, with $1.1M in brand drug costs.
Does Gregory Kalemkerian, MD prescribe opioids? ▼
Yes, Gregory Kalemkerian, MD had 47 opioid claims in 2023 with an opioid prescribing rate of 12.2%.
How many Medical Oncology Physician providers are there in the US? ▼
There are 3,815 Medical Oncology Physician providers across 53 states in the US. The average Medical Oncology Physician provider writes 689 Medicare Part D claims per year.
What drugs does Gregory Kalemkerian, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Kalemkerian, MD's most frequently prescribed drugs include Oxycodone Hcl, Ondansetron Hcl, Tagrisso. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Kalemkerian, MD accept Medicare? ▼
Gregory Kalemkerian, MD appears in CMS Medicare data with 386 Part D claims and 94 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Kalemkerian, MD's credentials? ▼
Gregory Kalemkerian, MD's NPI is 1316023278 with credentials MD. 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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.