NPI registry status
Active
2026 NPPES data Specialist NPI 1164428207 M.D.
Verify on CMS → Mark Blitzer, M.D.
Specialist in New Haven, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,658 in Specialist, 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
2K
Medicare Part D claims · 526 beneficiaries · Specialist avg: 1K
Generic prescribing
72%
generic claims · 28% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
73.6/100
▼ 10 pts below national avg 83.1 · Mid-tier
Industry payments
$3.6K
8 payments · CMS Open Payments (Sunshine Act)
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
Mark Blitzer, M.D. reported a CMS MIPS final score of 73.6/100 - below the 83.1 national average - and filed 2,439 Medicare Part D claims in 2023.
- 73.6/100
- MIPS score · -10 vs avg
- 2K
- Part D claims, 2023
- 72%
- generic prescribing
- $3.6K
- industry payments (Sunshine Act)
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.
Mark Blitzer, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
74 11th percentile higher than 11% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Mark Blitzer, M.D. sits
This provider among specialist peers
Across the 4,869 specialist providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Blitzer, M.D. writes more Part D claims than 76% of them and scores higher on MIPS quality than 21% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one specialist peer from a representative sample of 60; the gold marker is Mark Blitzer, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Mark Blitzer, M.D.?
Below national averagePrimary specialty
Specialist
Medicare Part D claims
2,439 65% vs specialty avg
MIPS final score
73.6/100 9.5 pts vs avg
Specialty distribution in Connecticut
How Specialist compares to other specialties among Connecticut providers
Medicare quality performance, MIPS
Mark Blitzer, M.D.'s 2023 MIPS final score plotted against the Specialist national average
- MIPS Final Score
- 73.6/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Specialist) - 73.6/100 vs national avg 83.1
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).
Mark Blitzer, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 330 ORCHARD ST., New Haven, CT, 06511, with a listed phone of (203) 867-5400. NPI 1164428207 was issued on 06/23/2005.
Medicare Part D records for calendar year 2023 show 2,439 prescription claims written by this provider, covering 526 Medicare beneficiaries and totaling roughly $977K in drug spend, split 28% brand-name and 72% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 73.6/100 for the 2023 performance year (Quality 75.8, Cost 51.4), compared with the national average of 83.1.
Specialist is a high-volume specialty nationwide, with 69,658 enrolled providers across 55 states and an average of 1,474 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 | 1164428207 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/23/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
73.5637
Final Score
Avg: 83.1
75.8435
Quality
51.4318
Cost
74
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Mark Blitzer, 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.
Yale University
Norwich, CT
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Mark Blitzer, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$3.6K
Largest payer
Boston Scientific Corporation
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Above average
Mark Blitzer, M.D. - brand share 28.0%
Specialist average
28% brand-name claims vs 72% generic, on 2,439 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.
2,439
Total Claims
$977K
Total Drug Cost
526
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 6,575
- Total Day Supply
- 196,336
- Brand vs Generic
- 28% brand / 72% generic
- Brand Drug Cost
- $892K
- Generic Drug Cost
- $85K
Patient Demographics
- Average Patient Age
- 76.6 years
- Avg HCC Risk Score
- 1.73
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 29, 65-74: 178, 75-84: 229, 85+: 90
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Blitzer, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Metoprolol Succinate
Metoprolol Succinate
487 claims
- Eliquis
Eliquis
461 claims
- Flecainide Acetate
Flecainide Acetate
220 claims
- Xarelto 173
Xarelto
173 claims
- Amiodarone Hcl 138
Amiodarone Hcl
138 claims
- Diltiazem 24hr Er … 137
Diltiazem 24hr Er (Cd)
137 claims
- Sotalol 112
Sotalol
112 claims
- Carvedilol 74
Carvedilol
74 claims
| Drug | Claims |
|---|---|
| Metoprolol Succinate | 487 |
| Eliquis Apixaban | 461 |
| Flecainide Acetate | 220 |
| Xarelto Rivaroxaban | 173 |
| Amiodarone Hcl | 138 |
| Diltiazem 24hr Er (Cd) Diltiazem Hcl | 137 |
| Sotalol Sotalol Hcl | 112 |
| Carvedilol | 74 |
| Amlodipine Besylate | 62 |
| Metoprolol Tartrate | 59 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Mark Blitzer, M.D. fits within the Specialist landscape nationally.
69,658
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Mark Blitzer, M.D.'s 2,439 claims are above the specialty average of 1,474.
Nearby Specialist Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Blitzer.
Dr. Jay Abbott
M.D.
Litchfield, CT
Dr. Karen Abrams
M.D.
Westport, CT
Dr. Micheal Acocella
B.S., P.T.
Greenwich, CT
Dr. Diana Adams
M.D.
Greenwich, CT
Dr. Zosimo Adefuin
MD
Bridgeport, CT
Compare Specialist 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 Connecticut medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Specialist 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 Mark Blitzer, M.D.'s specialty? ▼
Mark Blitzer, M.D. specializes in Specialist and practices in New Haven, Connecticut. Credentials: M.D..
How much does Mark Blitzer, M.D. prescribe under Medicare Part D? ▼
In 2023, Mark Blitzer, M.D. wrote 2,439 Medicare Part D claims totaling $977K in drug costs for 526 beneficiaries.
What is Mark Blitzer, M.D.'s Medicare quality score? ▼
Mark Blitzer, M.D. has a CMS MIPS Final Score of 73.6/100 (Quality: 75.8, Cost: 51.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Blitzer, M.D. located? ▼
Mark Blitzer, M.D. is located at 330 ORCHARD ST., New Haven, CT, 06511. Phone: (203) 867-5400.
What is Mark Blitzer, M.D.'s NPI number? ▼
Mark Blitzer, M.D.'s National Provider Identifier (NPI) is 1164428207, issued on 06/23/2005.
Does Mark Blitzer, M.D. prescribe more brand-name or generic drugs? ▼
Mark Blitzer, M.D.'s prescribing is 28% brand-name and 72% generic drugs by claim count, with $892K in brand drug costs.
How many Specialist providers are there in the US? ▼
There are 69,658 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Mark Blitzer, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Blitzer, M.D.'s most frequently prescribed drugs include Metoprolol Succinate, Eliquis, Flecainide Acetate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Blitzer, M.D. accept Medicare? ▼
Mark Blitzer, M.D. appears in CMS Medicare data with 2,439 Part D claims and 526 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Blitzer, M.D.'s credentials? ▼
Mark Blitzer, M.D.'s NPI is 1164428207 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.