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2026 NPPES data General Practice Physician NPI 1811973951 M.D.
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Kathy Tieu, M.D.

General Practice Physician in Fairfax, 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 16,838 in General Practice 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
839
Medicare Part D claims · 283 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
89%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
95.6/100
▲ 12 pts above national avg 83.5 · Exceptional
Industry payments
$219.29
6 payments · CMS Open Payments (Sunshine Act)
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

Kathy Tieu, M.D. reported a CMS MIPS final score of 95.6/100 - above the 83.5 national average - and filed 839 Medicare Part D claims in 2024.

95.6/100
MIPS score · +12 vs avg
839
Part D claims, 2024
89%
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 Kathy Tieu, M.D.

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 1811973951), first enumerated 12/20/2005.

    Source: CMS NPPES

  • Reported

    Medicare Part D participation

    Filed 839 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 95.6/100 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.

    Source: NUCC taxonomy + CMS participation heuristic

  • Reported

    Hospital affiliations

    1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.

    Source: CMS Care Compare

  • Reported

    Industry payment transparency

    $219.29 in reported industry payments (6 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.

    Source: CMS Open Payments

  • 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 1811973951 · General Practice Physician

NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-ELITE · RX-LIGHT · BOOK-THIN · PHOTO-FINISH

  • NPI-10 1811973951
  • ENUM-LEGACY 2005
  • TAX-MID 17K General Practice
  • MIPS-ELITE 95.6/100
  • RX-LIGHT 839
  • BOOK-THIN 392 in Virginia
  • PHOTO-FINISH Colin Martyn, M.D. · ±0.0

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

Kathy Tieu, M.D.'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.

96 ≥ 78th percentile 78% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). Below this entry. 40–50: 2,928 measured providers (1%). Below this entry. 50–60: 5,882 measured providers (1%). Below this entry. 60–70: 13,906 measured providers (3%). Below this entry. 70–80: 94,570 measured providers (21%). Below this entry. 80–90: 129,887 measured providers (29%). Below this entry. 90+: 189,403 measured providers (42%). This entry sits in this band. This provider 0 100 every measured MIPS clinician, bucketed by value

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 Kathy Tieu, M.D. sits

This provider among general practice physician peers

Across the 714 general practice physician providers who report both Medicare Part D prescribing and a MIPS quality score, Kathy Tieu, M.D. writes more Part D claims than 58% of them and scores higher on MIPS quality than 82% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 62 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 17Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 87Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 77Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 35 · MIPS quality, percentile: 27Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 2 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 87 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 62Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 72 · MIPS quality, percentile: 67Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 75Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 92Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 7Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 23 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 45Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 25Kathy Tieu, M.D., Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 82
Part D claim volume vs MIPS quality, by specialty percentile

Each dot is one general practice physician peer from a representative sample of 60; the gold marker is Kathy Tieu, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

✓
Board certification likely (heuristic, not verified)

Kathy Tieu, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Kathy Tieu, M.D.?

High performer (top quartile)

NPI registry status

Active

Issued 12/20/2005

NPI 1811973951

Primary specialty

General Practice Physician

Mid-sized

16,838 US NPIs in this specialty

Medicare Part D claims

839 72% vs specialty avg

2024 prescription claims

Specialty avg: 2,957

MIPS final score

95.6/100 12.1 pts vs avg

Exceptional band

vs 83.5 national avg

Specialty distribution in Virginia

How General Practice Physician compares to other specialties among Virginia providers

Virginia providers
Behavior Technician5.5%Clinical Social Worker5.2%Student in an Organized Heal…4.7%Physical Therapist4.6%Pharmacist4.4%Professional Counselor4%General Practice Physician0.3%
Largest specialties in Virginia (% of in-state providers)

Medicare quality performance, MIPS

Kathy Tieu, M.D.'s 2023 MIPS final score plotted against the General Practice Physician national average

High performer (top quartile)
MIPS Final Score
95.6/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%95.6%
MIPS final score (General Practice Physician) - 95.6/100 vs national avg 83.5
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

3700 JOSEPH SIEWICK DR
Fairfax, VA 22033
(703) 620-8900

Provider Details

NPI 1811973951
Specialty General Practice Physician
Credentials M.D.
Gender Female
NPI Issued 12/20/2005

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

95.6225
Final Score
Measured-score avg: 83.5
91.245
Quality

Reporting: Individual

Hospital and facility affiliations

Facilities where Kathy Tieu, 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.

The Clinical Skin Center OF Northern Virginia PLLC
Fairfax, 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).

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 Kathy Tieu, M.D.. Source: openpaymentsdata.cms.gov.

Total received

$219

Largest payer

Galderma Laboratories, L.P.

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

Kathy Tieu, M.D. - brand share 11.0%
General Practice Physician average

11% brand-name claims vs 89% generic, on 839 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.

839
Total Claims
$286K
Total Drug Cost
283
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,126.2
Total Day Supply
31,247
Brand vs Generic
11% brand / 89% generic
Brand Drug Cost
$243K
Generic Drug Cost
$43K
Antibiotic Claims
12

Patient Demographics

Average Patient Age
74.7 years
Avg HCC Risk Score
0.90
Gender Split
59% female / 41% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.

What Kathy Tieu, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2024

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2024
Drug Claims
Clobetasol Propionate
 140
Ketoconazole
 106
Doxycycline Hyclate
 97
Doxycycline Ir-Dr
Doxycycline Monohydrate
51
Triamcinolone Acetonide
 48
Minoxidil
 45
Gabapentin
 37
Metronidazole
 30
Finasteride
 24
Terbinafine Hcl
 22

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

More General Practice Physician in VA → All providers in Virginia → Compare specialties →

General Practice Physician Overview

How Kathy Tieu, M.D. fits within the General Practice Physician landscape nationally.

16,838
General Practice Physician Providers in US
56
States with General Practice Physician
2,957
Avg Claims per Provider

Kathy Tieu, M.D.'s 839 claims are below the specialty average of 2,957.

Nationwide General Practice Physician peers with similar MIPS or enrollment year

Two federal-record peer sets for Tieu, both outside Virginia so the neighborhoods are not geographic containment.

Similar MIPS final score

Nearest same-specialty clinicians by CMS MIPS final score (95.6 here).

Scott Kaufman 95.6 NJ Katie Sanghvi 95.6 NJ Erin Lowe 95.6 CT Colin Martyn 95.6 IN

Same NPPES enumeration year (2005)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

Cesar Perez Homestead, FL Carlos Sacristan Passaic, NJ James Martin Stow, OH Larry Levine Dunedin, FL

Nearby General Practice Physician Providers in Virginia

Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Tieu.

One of 392 General Practice Physician providers enrolled in Virginia, 5 are shown here.

Syed Abid
MBBS
Lynchburg, VA
Louisa Acquaye Kessie
Triangle, VA
Dr. Shannon Adams
D.O. / M.S.
Portsmouth, VA
Izza Ahmed
Lynchburg, VA
Dr. Syed Ahmed
MD
Vienna, VA

Compare General Practice Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is Kathy Tieu, M.D.'s specialty? ▼
Kathy Tieu, M.D. specializes in General Practice Physician and practices in Fairfax, Virginia. Credentials: M.D..
How much does Kathy Tieu, M.D. prescribe under Medicare Part D? ▼
In 2024, Kathy Tieu, M.D. wrote 839 Medicare Part D claims totaling $286K in drug costs for 283 beneficiaries.
What is Kathy Tieu, M.D.'s Medicare quality score? ▼
Kathy Tieu, M.D. has a CMS MIPS Final Score of 95.6/100 (Quality: 91.2). 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 Kathy Tieu, M.D. located? ▼
Kathy Tieu, M.D. is located at 3700 JOSEPH SIEWICK DR, Fairfax, VA, 22033. Phone: (703) 620-8900.
What is Kathy Tieu, M.D.'s NPI number? ▼
Kathy Tieu, M.D.'s National Provider Identifier (NPI) is 1811973951, issued on 12/20/2005.
Does Kathy Tieu, M.D. prescribe more brand-name or generic drugs? ▼
Kathy Tieu, M.D.'s prescribing is 11% brand-name and 89% generic drugs by claim count, with $243K in brand drug costs.
How many General Practice Physician providers are there in the US? ▼
There are 16,838 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,957 Medicare Part D claims per year.
What drugs does Kathy Tieu, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Kathy Tieu, M.D.'s most frequently prescribed drugs include Clobetasol Propionate, Ketoconazole, Doxycycline Hyclate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Kathy Tieu, M.D. accept Medicare? ▼
Kathy Tieu, M.D. appears in CMS Medicare data with 839 Part D claims and 283 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Kathy Tieu, M.D.'s credentials? ▼
Kathy Tieu, M.D.'s NPI is 1811973951 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 (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

Compiled from official public sources by the editorial process.

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.