NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1689698615 MD
Verify on CMS → Frederick Tan, MD
Nephrology Physician in Bryan, Texas.
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
2K
Medicare Part D claims · 425 beneficiaries · Nephrology Physician avg: 2K
Generic prescribing
93%
generic claims · 7% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
13.1/100
▼ 70 pts below national avg 83.5 · Penalty band
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Frederick Tan, MD reported a CMS MIPS final score of 13.1/100 - below the 83.5 national average - and filed 2,328 Medicare Part D claims in 2024.
- 13.1/100
- MIPS score · -70 vs avg
- 2K
- Part D claims, 2024
- 93%
- 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.
Federal trust snapshot
What official records show about Frederick Tan, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1689698615), first enumerated 07/26/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 2,328 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 13.1/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- 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.
- State context
State board disciplinary context
Texas statewide board action statistics are published annually — these figures describe aggregate state activity, not Frederick Tan, MD's individual license status. Verify directly with the state medical board.
Source: TMB annual report 2023
- 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 1689698615 · Nephrology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-LOW · RX-MID · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1689698615
- ENUM-LEGACY 2006
- TAX-MID 11K Nephrology Physician
- MIPS-LOW 13.1/100
- RX-MID 2,328
- BOOK-LIGHT 896 in Texas
- PHOTO-FINISH David McFadden · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Tan · this provi…
Tan · this provider
13.1 MIPS pts
- David McFadden ·…
David McFadden
13.1 MIPS pts
- Jeremy Sorkin · …
Jeremy Sorkin
13.2 MIPS pts
- Tarak Shah · near
Tarak Shah
13.2 MIPS pts
- Pranay Kathuria …
Pranay Kathuria
13.2 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Frederick Tan, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
13 ≥ 2nd percentile 2% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Frederick Tan, MD sits
This provider among nephrology physician peers
Across the 2,230 nephrology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Frederick Tan, MD writes more Part D claims than 82% of them and scores higher on MIPS quality than 4% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one nephrology physician peer from a representative sample of 60; the gold marker is Frederick Tan, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Frederick Tan, 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 Frederick Tan, MD?
Below national averagePrimary specialty
Nephrology Physician
Medicare Part D claims
2,328 54% vs specialty avg
MIPS final score
13.1/100 70.4 pts vs avg
Specialty distribution in Texas
How Nephrology Physician compares to other specialties among Texas providers
Medicare quality performance, MIPS
Frederick Tan, MD's 2023 MIPS final score plotted against the Nephrology Physician national average
- MIPS Final Score
- 13.1/100
- vs 83.5 national avg · 2023 performance year
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 | 1689698615 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/26/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
13.1453
Final Score
Measured-score avg: 83.5
0
Quality
43.8177
Cost
Reporting: Individual
License & disciplinary context - Texas TMB 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 ~77K Texas medical licensees in 2023 - they are NOT specific to Frederick Tan, MD. To verify Frederick Tan, MD's current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases
TMB 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 Texas disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Generic-heavy
Frederick Tan, MD - brand share 7.0%
Nephrology Physician average
7% brand-name claims vs 93% generic, on 2,328 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.
2,328
Total Claims
$376K
Total Drug Cost
425
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 5,337.567
- Total Day Supply
- 157,713
- Brand vs Generic
- 7% brand / 93% generic
- Brand Drug Cost
- $268K
- Generic Drug Cost
- $108K
- Antibiotic Claims
- 48
Patient Demographics
- Average Patient Age
- 73.1 years
- Avg HCC Risk Score
- 3.71
- Gender Split
- 49% female / 51% male
- Age Distribution
- <65: 69, 65-74: 151, 75-84: 153, 85+: 52
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Frederick Tan, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Calcitriol
Calcitriol
446 claims
- Hydralazine Hcl 153
Hydralazine Hcl
153 claims
- Nifedipine Er 126
Nifedipine Er
126 claims
- Clonidine Hcl 121
Clonidine Hcl
121 claims
- Losartan Potassium 113
Losartan Potassium
113 claims
- Amlodipine Besylate 112
Amlodipine Besylate
112 claims
- Sevelamer Carbonate 96
Sevelamer Carbonate
96 claims
- Metoprolol Succinate 84
Metoprolol Succinate
84 claims
| Drug | Claims |
|---|---|
| Calcitriol | 446 |
| Hydralazine Hcl | 153 |
| Nifedipine Er Nifedipine | 126 |
| Clonidine Hcl | 121 |
| Losartan Potassium | 113 |
| Amlodipine Besylate | 112 |
| Sevelamer Carbonate | 96 |
| Metoprolol Succinate | 84 |
| Velphoro Sucroferric Oxyhydroxide | 80 |
| Carvedilol | 51 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Frederick Tan, 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
Frederick Tan, MD's 2,328 claims are above the specialty average of 1,511.
Nationwide Nephrology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Tan, both outside Texas so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (13.1 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Nephrology Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Tan.
One of 896 Nephrology Physician providers enrolled in Texas, 5 are shown here.
Dr. Bernardino Abaya
M.D.
Houston, TX
Dr. Aisha Abbasi
MD
Conroe, TX
Dr. Mohammed Abdulaziz
MD
Laredo, TX
Dr. Mai Abouelsaad
M.D.
Houston, TX
Dr. Fadi Abouzahr
MD
San Antonio, TX
Compare Nephrology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Frederick Tan, MD's specialty? ▼
Frederick Tan, MD specializes in Nephrology Physician and practices in Bryan, Texas. Credentials: MD.
How much does Frederick Tan, MD prescribe under Medicare Part D? ▼
In 2024, Frederick Tan, MD wrote 2,328 Medicare Part D claims totaling $376K in drug costs for 425 beneficiaries.
What is Frederick Tan, MD's Medicare quality score? ▼
Frederick Tan, MD has a CMS MIPS Final Score of 13.1/100 (Quality: 0, Cost: 43.8). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Frederick Tan, MD located? ▼
Frederick Tan, MD is located at 2801 E 29TH ST, Bryan, TX, 77802. Phone: (979) 774-3960.
What is Frederick Tan, MD's NPI number? ▼
Frederick Tan, MD's National Provider Identifier (NPI) is 1689698615, issued on 07/26/2006.
Does Frederick Tan, MD prescribe more brand-name or generic drugs? ▼
Frederick Tan, MD's prescribing is 7% brand-name and 93% generic drugs by claim count, with $268K 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 Frederick Tan, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Frederick Tan, MD's most frequently prescribed drugs include Calcitriol, Hydralazine Hcl, Nifedipine Er. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Frederick Tan, MD accept Medicare? ▼
Frederick Tan, MD appears in CMS Medicare data with 2,328 Part D claims and 425 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Frederick Tan, MD's credentials? ▼
Frederick Tan, MD's NPI is 1689698615 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.
- 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 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.