NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1619405552 MD
Verify on CMS → Christopher Farmakis, MD
Nephrology Physician in Fredericksburg, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,806 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
585
Medicare Part D claims · 188 beneficiaries · Nephrology Physician avg: 2K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Christopher Farmakis, MD filed 585 Medicare Part D claims in 2024 as a Nephrology Physician in Fredericksburg, Virginia, prescribing 88% generic.
- 585
- Part D claims, 2024
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥65th
- 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.
Federal trust snapshot
What official records show about Christopher Farmakis, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1619405552), first enumerated 05/23/2017.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 585 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1619405552 · Nephrology Physician
NPI-10 · ENUM-RECENT · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1619405552
- ENUM-RECENT 2017
- TAX-MID 11K Nephrology Physician
- RX-LIGHT 585
- BOOK-THIN 268 in Virginia
- PHOTO-ENUM Nicholas Salupo, DO · 2017
Christopher Farmakis, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
585 ≥ 65th percentile 65% of 1,416,883 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 · 2024
✓
Board certification likely (heuristic, not verified)
Christopher Farmakis, 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 Christopher Farmakis, MD?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
585 61% vs specialty avg
Specialty distribution in Virginia
How Nephrology Physician compares to other specialties among Virginia 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).
Practice Address
Provider Details
| NPI | 1619405552 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/23/2017 |
Hospital and facility affiliations
Facilities where Christopher Farmakis, 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.
Fredericksburg Nephrology Associates Inc
Fredericksburg, VA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Christopher Farmakis, MD - brand share 12.0%
Nephrology Physician average
12% brand-name claims vs 88% generic, on 585 2024 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 2024.
585
Total Claims
$120K
Total Drug Cost
188
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,148.567
- Total Day Supply
- 34,022
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $99K
- Generic Drug Cost
- $21K
Patient Demographics
- Average Patient Age
- 72.1 years
- Avg HCC Risk Score
- 4.54
- Gender Split
- 46% female / 54% male
- Age Distribution
- <65: 30, 65-74: 73, 75-84: 59, 85+: 26
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Christopher Farmakis, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Calcitriol
Calcitriol
130 claims
- Sevelamer Carbonate
Sevelamer Carbonate
54 claims
- Amlodipine Besylate 43
Amlodipine Besylate
43 claims
- Losartan Potassium 37
Losartan Potassium
37 claims
- Lisinopril 32
Lisinopril
32 claims
- Farxiga 26
Farxiga
26 claims
- Spironolactone 24
Spironolactone
24 claims
- Potassium Citrate Er 19
Potassium Citrate Er
19 claims
| Drug | Claims |
|---|---|
| Calcitriol | 130 |
| Sevelamer Carbonate | 54 |
| Amlodipine Besylate | 43 |
| Losartan Potassium | 37 |
| Lisinopril | 32 |
| Farxiga Dapagliflozin Propanediol | 26 |
| Spironolactone | 24 |
| Potassium Citrate Er Potassium Citrate | 19 |
| Velphoro Sucroferric Oxyhydroxide | 18 |
| Carvedilol | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Christopher Farmakis, MD fits within the Nephrology Physician landscape nationally.
10,806
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,511
Avg Claims per Provider
Christopher Farmakis, MD's 585 claims are below the specialty average of 1,511.
Nationwide Nephrology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Farmakis, both outside Virginia so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2017)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Nephrology Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Farmakis.
One of 268 Nephrology Physician providers enrolled in Virginia, 5 are shown here.
Dr. Mark Aarons
M.D.
Arlington, VA
Emaad Abdel-Rahman
Charlottesville, VA
Dr. Walid Abou Assi
M.D.
Richmond, VA
Dr. Christopher Acker
M.D.
Richmond, VA
Dr. Oscar Adler
M.D., PHD
Leesburg, VA
Compare Nephrology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Christopher Farmakis, MD's specialty? ▼
Christopher Farmakis, MD specializes in Nephrology Physician and practices in Fredericksburg, Virginia. Credentials: MD.
How much does Christopher Farmakis, MD prescribe under Medicare Part D? ▼
In 2024, Christopher Farmakis, MD wrote 585 Medicare Part D claims totaling $120K in drug costs for 188 beneficiaries.
Where is Christopher Farmakis, MD located? ▼
Christopher Farmakis, MD is located at 101 PARK HILL DR, Fredericksburg, VA, 22401. Phone: (540) 371-3010.
What is Christopher Farmakis, MD's NPI number? ▼
Christopher Farmakis, MD's National Provider Identifier (NPI) is 1619405552, issued on 05/23/2017.
Does Christopher Farmakis, MD prescribe more brand-name or generic drugs? ▼
Christopher Farmakis, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $99K in brand drug costs.
How many Nephrology Physician providers are there in the US? ▼
There are 10,806 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,511 Medicare Part D claims per year.
What drugs does Christopher Farmakis, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Christopher Farmakis, MD's most frequently prescribed drugs include Calcitriol, Sevelamer Carbonate, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Christopher Farmakis, MD accept Medicare? ▼
Christopher Farmakis, MD appears in CMS Medicare data with 585 Part D claims and 188 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Christopher Farmakis, MD's credentials? ▼
Christopher Farmakis, MD's NPI is 1619405552 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.