NPI registry status
Active
2026 NPPES data Geriatric Medicine (Family Medicine) Physician NPI 1659362200 MD
Verify on CMS → Herbert Acker, MD
Geriatric Medicine (Family Medicine) Physician in Fort Wayne, Indiana.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,779 in Geriatric Medicine (Family 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
5K
Medicare Part D claims · 395 beneficiaries · Geriatric Medicine (Family Medicine) Physician avg: 5K
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
88/100
▲ 5 pts above national avg 83.1 · Above neutral
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
Herbert Acker, MD reported a CMS MIPS final score of 88/100 - above the 83.1 national average - and filed 4,772 Medicare Part D claims in 2023.
- 88/100
- MIPS score · +5 vs avg
- 5K
- Part D claims, 2023
- 87%
- 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.
Herbert Acker, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
88 Top 46% higher than 54% 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 Herbert Acker, MD sits
This provider among geriatric medicine (family medicine) physician peers
Across the 298 geriatric medicine (family medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Herbert Acker, MD writes more Part D claims than 61% of them and scores higher on MIPS quality than 61% - placing this provider in the high-volume, high-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 geriatric medicine (family medicine) physician peer from a representative sample of 60; the gold marker is Herbert Acker, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Herbert Acker, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Herbert Acker, MD?
High performer (top quartile)Primary specialty
Geriatric Medicine (Family Medicine) Physician
Medicare Part D claims
4,772 2% vs specialty avg
MIPS final score
88/100 4.9 pts vs avg
Specialty distribution in Indiana
How Geriatric Medicine (Family Medicine) Physician compares to other specialties among Indiana providers
Medicare quality performance, MIPS
Herbert Acker, MD's 2023 MIPS final score plotted against the Geriatric Medicine (Family Medicine) Physician national average
- MIPS Final Score
- 88/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Geriatric Medicine (Family Medicine) Physician) - 88/100 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).
Herbert Acker, MD appears in the CMS NPPES registry as a Geriatric Medicine (Family Medicine) Physician provider holding MD credentials at 3534 BROOKLYN AVE, Fort Wayne, IN, 46809, with a listed phone of (260) 478-5100. NPI 1659362200 was issued on 11/02/2005.
Medicare Part D records for calendar year 2023 show 4,772 prescription claims written by this provider, covering 395 Medicare beneficiaries and totaling roughly $433K in drug spend, split 12% brand-name and 87% generic by claim count, with an opioid prescribing rate of 2.2%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 88/100 for the 2023 performance year (Quality 74), compared with the national average of 83.1.
Geriatric Medicine (Family Medicine) Physician is a narrow specialty nationwide, with 1,779 enrolled providers across 52 states and an average of 4,854 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 | 1659362200 |
|---|---|
| Specialty | Geriatric Medicine (Family Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/02/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
87.9565
Final Score
Avg: 83.1
74.048
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Brand vs generic prescribing mix · Typical
Herbert Acker, MD - brand share 12.0%
Geriatric Medicine (Family Medicine) Physician average
12% brand-name claims vs 87% generic, on 4,772 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.
4,772
Total Claims
$433K
Total Drug Cost
395
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 10,759
- Total Day Supply
- 314,286
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $376K
- Generic Drug Cost
- $55K
- Opioid Claims
- 105 (2.2% rate)
- Antibiotic Claims
- 96
Patient Demographics
- Average Patient Age
- 76.1 years
- Avg HCC Risk Score
- 1.05
- Gender Split
- 53% female / 47% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Herbert Acker, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
377 claims
- Hydrochlorothiazide
Hydrochlorothiazide
312 claims
- Lisinopril
Lisinopril
288 claims
- Amlodipine Besylate
Amlodipine Besylate
219 claims
- Metoprolol Succinate
Metoprolol Succinate
162 claims
- Levothyroxine Sodium
Levothyroxine Sodium
151 claims
- Simvastatin 146
Simvastatin
146 claims
- Sertraline Hcl 113
Sertraline Hcl
113 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 377 |
| Hydrochlorothiazide | 312 |
| Lisinopril | 288 |
| Amlodipine Besylate | 219 |
| Metoprolol Succinate | 162 |
| Levothyroxine Sodium | 151 |
| Simvastatin | 146 |
| Sertraline Hcl | 113 |
| Pantoprazole Sodium | 95 |
| Metformin Hcl | 94 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Geriatric Medicine (Family Medicine) Physician in IN →
All providers in Indiana →
Compare specialties →
Geriatric Medicine (Family Medicine) Physician Overview
How Herbert Acker, MD fits within the Geriatric Medicine (Family Medicine) Physician landscape nationally.
1,779
Geriatric Medicine (Family Medicine) Physician Providers in US
52
States with Geriatric Medicine (Family Medicine) Physician
4,854
Avg Claims per Provider
Herbert Acker, MD's 4,772 claims are below the specialty average of 4,854.
Nearby Geriatric Medicine (Family Medicine) Physician Providers in Indiana
Other clinicians with the same primary specialty enrolled in Indiana, drawn from the same CMS NPPES roster as Acker.
Dr. Sarah Adrian-Stephenson
NP
Avon, IN
Dr. Thomas Alley
M.D.
Indianapolis, IN
Dr. Jack Bartoszek
D.O.
Mishawaka, IN
Dr. James Buchanan
MD
Auburn, IN
Dr. Bruce Burton
MD
Corydon, IN
Compare Geriatric Medicine (Family 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 Indiana medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Geriatric Medicine (Family 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 Herbert Acker, MD's specialty? ▼
Herbert Acker, MD specializes in Geriatric Medicine (Family Medicine) Physician and practices in Fort Wayne, Indiana. Credentials: MD.
How much does Herbert Acker, MD prescribe under Medicare Part D? ▼
In 2023, Herbert Acker, MD wrote 4,772 Medicare Part D claims totaling $433K in drug costs for 395 beneficiaries.
What is Herbert Acker, MD's Medicare quality score? ▼
Herbert Acker, MD has a CMS MIPS Final Score of 88/100 (Quality: 74). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Herbert Acker, MD located? ▼
Herbert Acker, MD is located at 3534 BROOKLYN AVE, Fort Wayne, IN, 46809. Phone: (260) 478-5100.
What is Herbert Acker, MD's NPI number? ▼
Herbert Acker, MD's National Provider Identifier (NPI) is 1659362200, issued on 11/02/2005.
Does Herbert Acker, MD prescribe more brand-name or generic drugs? ▼
Herbert Acker, MD's prescribing is 12% brand-name and 87% generic drugs by claim count, with $376K in brand drug costs.
Does Herbert Acker, MD prescribe opioids? ▼
Yes, Herbert Acker, MD had 105 opioid claims in 2023 with an opioid prescribing rate of 2.2%.
How many Geriatric Medicine (Family Medicine) Physician providers are there in the US? ▼
There are 1,779 Geriatric Medicine (Family Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Family Medicine) Physician provider writes 4,854 Medicare Part D claims per year.
What drugs does Herbert Acker, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Herbert Acker, MD's most frequently prescribed drugs include Atorvastatin Calcium, Hydrochlorothiazide, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Herbert Acker, MD accept Medicare? ▼
Herbert Acker, MD appears in CMS Medicare data with 4,772 Part D claims and 395 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Herbert Acker, MD's credentials? ▼
Herbert Acker, MD's NPI is 1659362200 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.
- 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.