NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1154308435 M.D.
Verify on CMS → Gregory Merten, M.D.
Nephrology Physician in Charlotte, North Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,569 in Nephrology 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
620
Medicare Part D claims · 173 beneficiaries · Nephrology Physician avg: 1K
Generic prescribing
90%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$139.62
3 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
Gregory Merten, M.D. filed 620 Medicare Part D claims in 2023 as a Nephrology Physician in Charlotte, North Carolina, prescribing 90% generic.
- 620
- Part D claims, 2023
- 90%
- 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.
Gregory Merten, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
620 Top 31% higher than 69% 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)
Gregory Merten, 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 Gregory Merten, M.D.?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
620 57% vs specialty avg
Specialty distribution in North Carolina
How Nephrology Physician compares to other specialties among North Carolina 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 Nephrology 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).
Gregory Merten, M.D. appears in the CMS NPPES registry as a Nephrology Physician provider holding M.D. credentials at 10710 SIKES PL STE 100, Charlotte, NC, 28277, with a listed phone of (704) 248-5101. NPI 1154308435 was issued on 12/28/2005.
Medicare Part D records for calendar year 2023 show 620 prescription claims written by this provider, covering 173 Medicare beneficiaries and totaling roughly $136K in drug spend, split 10% brand-name and 90% generic by claim count.
Nephrology Physician is a mid-sized specialty nationwide, with 10,569 enrolled providers across 55 states and an average of 1,454 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 | 1154308435 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 12/28/2005 |
Hospital and facility affiliations
Facilities where Gregory Merten, 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.
Metrolina Nephrology Associates PA
Charlotte, NC
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 Gregory Merten, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$140
Largest payer
Bayer Healthcare Pharmaceuticals Inc.
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 · Typical
Gregory Merten, M.D. - brand share 10.0%
Nephrology Physician average
10% brand-name claims vs 90% generic, on 620 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.
620
Total Claims
$136K
Total Drug Cost
173
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,518
- Total Day Supply
- 44,682
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $108K
- Generic Drug Cost
- $27K
- Antibiotic Claims
- 21
Patient Demographics
- Average Patient Age
- 71.6 years
- Avg HCC Risk Score
- 4.01
- Gender Split
- 49% female / 51% male
- Age Distribution
- <65: 28, 65-74: 58, 75-84: 75, 85+: 12
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Merten, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Calcitriol
Calcitriol
100 claims
- Losartan Potassium
Losartan Potassium
49 claims
- Amlodipine Besylate 34
Amlodipine Besylate
34 claims
- Furosemide 33
Furosemide
33 claims
- Doxazosin Mesylate 29
Doxazosin Mesylate
29 claims
- Lisinopril 29
Lisinopril
29 claims
- Sevelamer Carbonate 24
Sevelamer Carbonate
24 claims
- Velphoro 18
Velphoro
18 claims
| Drug | Claims |
|---|---|
| Calcitriol | 100 |
| Losartan Potassium | 49 |
| Amlodipine Besylate | 34 |
| Furosemide | 33 |
| Doxazosin Mesylate | 29 |
| Lisinopril | 29 |
| Sevelamer Carbonate | 24 |
| Velphoro Sucroferric Oxyhydroxide | 18 |
| Atorvastatin Calcium | 15 |
| Hydralazine Hcl | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Gregory Merten, M.D. fits within the Nephrology Physician landscape nationally.
10,569
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,454
Avg Claims per Provider
Gregory Merten, M.D.'s 620 claims are below the specialty average of 1,454.
Nearby Nephrology Physician Providers in North Carolina
Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as Merten.
Dr. Sosan Abdullah
MD
Morganton, NC
Dr. Tariq Abo-Kamil
MD
Henderson, NC
Dr. Moses Aboagye-Kumi
M.D.
Fayetteville, NC
Dr. Maureen Achuko
M.D.
Fayetteville, NC
Dr. Patricia Adams
MD
Winston Salem, NC
Compare Nephrology 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 North Carolina medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nephrology 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 Gregory Merten, M.D.'s specialty? ▼
Gregory Merten, M.D. specializes in Nephrology Physician and practices in Charlotte, North Carolina. Credentials: M.D..
How much does Gregory Merten, M.D. prescribe under Medicare Part D? ▼
In 2023, Gregory Merten, M.D. wrote 620 Medicare Part D claims totaling $136K in drug costs for 173 beneficiaries.
Where is Gregory Merten, M.D. located? ▼
Gregory Merten, M.D. is located at 10710 SIKES PL STE 100, Charlotte, NC, 28277. Phone: (704) 248-5101.
What is Gregory Merten, M.D.'s NPI number? ▼
Gregory Merten, M.D.'s National Provider Identifier (NPI) is 1154308435, issued on 12/28/2005.
Does Gregory Merten, M.D. prescribe more brand-name or generic drugs? ▼
Gregory Merten, M.D.'s prescribing is 10% brand-name and 90% generic drugs by claim count, with $108K in brand drug costs.
How many Nephrology Physician providers are there in the US? ▼
There are 10,569 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,454 Medicare Part D claims per year.
What drugs does Gregory Merten, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Merten, M.D.'s most frequently prescribed drugs include Calcitriol, Losartan Potassium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Merten, M.D. accept Medicare? ▼
Gregory Merten, M.D. appears in CMS Medicare data with 620 Part D claims and 173 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Merten, M.D.'s credentials? ▼
Gregory Merten, M.D.'s NPI is 1154308435 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.
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.