2026 NPPES data Obstetrics & Gynecology Physician NPI 1538200142 M.D.
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MELANIE LAU, M.D.

Obstetrics & Gynecology Physician in HONOLULU, Hawaii. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
118
Medicare Part D claims · 57 beneficiaries · Obstetrics & Gynecology Physician avg: 179
Generic prescribing
75%
generic claims · 25% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
86.203/100
▲ 3 pts above national avg 83.1 · [object Object]

What the federal data shows

MELANIE LAU, M.D. reported a CMS MIPS final score of 86.203/100 — above the 83.1 national average — and filed 118 Medicare Part D claims in 2023.

86.203/100
MIPS score · +3 vs avg
118
Part D claims, 2023
75%
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.

MELANIE LAU, M.D.'s MIPS score vs every scored U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023 — the federal quality measure

86 Top 48% higher than 52% of 477,587 scored providers

0–10: 8,684 scored providers (2%). Below this entry. 10–20: 3,008 scored providers (1%). Below this entry. 20–30: 3,069 scored providers (1%). Below this entry. 30–40: 2,746 scored providers (1%). Below this entry. 40–50: 2,928 scored providers (1%). Below this entry. 50–60: 5,882 scored providers (1%). Below this entry. 60–70: 13,906 scored providers (3%). Below this entry. 70–80: 118,074 scored providers (25%). Below this entry. 80–90: 129,887 scored providers (27%). This entry sits in this band. 90–100: 189,403 scored providers (40%). Above this entry. This provider 0 100 every MIPS-scored clinician, bucketed by value

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

Board certification likely (heuristic — not verified)

MELANIE LAU, M.D. 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 MELANIE LAU, M.D.?

High performer (top quartile)

NPI registry status

Active

Issued 02/08/2007

NPI 1538200142

Primary specialty

Obstetrics & Gynecology Physician

Mid-sized

44,313 US NPIs in this specialty

Medicare Part D claims

118 34% vs specialty avg

2023 prescription claims

Specialty avg: 179

MIPS final score

86.203/100 3.1030000000000086% pts

Above neutral band

vs 83.1 national avg

Specialty distribution in Hawaii

How Obstetrics & Gynecology Physician compares to other specialties among Hawaii providers

Hawaii providers

Obstetrics & Gynecology Physician share within Hawaii

1. Obstetrics & Gynecology Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Obstetrics & Gynecology Physician share within Hawaii

Medicare quality performance — MIPS

MELANIE LAU, M.D.'s 2023 MIPS final score plotted against the Obstetrics & Gynecology Physician national average

High performer (top quartile)
MIPS Final Score
86.203/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Obstetrics & Gynecology Physician) — 86.203/100 vs national avg 83.1

0%100%National avg83%86.2%
MIPS final score (Obstetrics & Gynecology Physician) — 86.203/100 vs national avg 83.1

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).

MELANIE LAU, M.D. appears in the CMS NPPES registry as a Obstetrics & Gynecology Physician provider holding M.D. credentials at 1329 LUSITANA ST, HONOLULU, HI, 96813, with a listed phone of (808) 536-3690. NPI 1538200142 was issued on 02/08/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what LAU most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 118 prescription claims written by this provider, covering 57 Medicare beneficiaries and totaling roughly $34K in drug spend, split 25% brand-name and 75% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 86.203/100 for the 2023 performance year (Quality 80.286, Cost 73.7239), compared with the national average of 83.1.

Obstetrics & Gynecology Physician is a mid-sized specialty nationwide, with 44,313 enrolled providers across 56 states and an average of 179 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

1329 LUSITANA ST
HONOLULU, HI 96813

Provider Details

NPI 1538200142
Specialty Obstetrics & Gynecology Physician
Credentials M.D.
Gender Female
NPI Issued 02/08/2007

CMS Quality Score (MIPS)

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

86.203
Final Score
Avg: 83.1
80.286
Quality
73.7239
Cost
100
Promoting Interoperability

Reporting: Group practice

Brand vs generic prescribing mix · Above average

MELANIE LAU, M.D. — brand share 25.0%
Specialty average (est.)

25% brand-name claims vs 75% generic, on 118 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.

118
Total Claims
$34K
Total Drug Cost
57
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
295
Total Day Supply
8,454
Brand vs Generic
25% brand / 75% generic
Brand Drug Cost
$24K
Generic Drug Cost
$10K

Patient Demographics

Average Patient Age
71.7 years
Avg HCC Risk Score
0.72
Gender Split
100% female / 0% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What MELANIE LAU, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Estradiol
28
Valacyclovir
Valacyclovir Hcl
12
Prolia
Denosumab
11

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

Obstetrics & Gynecology Physician Overview

How MELANIE LAU, M.D. fits within the Obstetrics & Gynecology Physician landscape nationally.

44,313
Obstetrics & Gynecology Physician Providers in US
56
States with Obstetrics & Gynecology Physician
179
Avg Claims per Provider

MELANIE LAU, M.D.'s 118 claims are below the specialty average of 179.

Nearby Obstetrics & Gynecology Physician Providers in Hawaii

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

Compare Obstetrics & Gynecology Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is MELANIE LAU, M.D.'s specialty?
MELANIE LAU, M.D. specializes in Obstetrics & Gynecology Physician and practices in HONOLULU, Hawaii. Credentials: M.D..
How much does MELANIE LAU, M.D. prescribe under Medicare Part D?
In 2023, MELANIE LAU, M.D. wrote 118 Medicare Part D claims totaling $34K in drug costs for 57 beneficiaries.
What is MELANIE LAU, M.D.'s Medicare quality score?
MELANIE LAU, M.D. has a CMS MIPS Final Score of 86.203/100 (Quality: 80.286, Cost: 73.7239). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is MELANIE LAU, M.D. located?
MELANIE LAU, M.D. is located at 1329 LUSITANA ST, HONOLULU, HI, 96813. Phone: (808) 536-3690.
What is MELANIE LAU, M.D.'s NPI number?
MELANIE LAU, M.D.'s National Provider Identifier (NPI) is 1538200142, issued on 02/08/2007.
Does MELANIE LAU, M.D. prescribe more brand-name or generic drugs?
MELANIE LAU, M.D.'s prescribing is 25% brand-name and 75% generic drugs by claim count, with $24K in brand drug costs.
How many Obstetrics & Gynecology Physician providers are there in the US?
There are 44,313 Obstetrics & Gynecology Physician providers across 56 states in the US. The average Obstetrics & Gynecology Physician provider writes 179 Medicare Part D claims per year.
What drugs does MELANIE LAU, M.D. prescribe most often?
Based on 2023 Medicare Part D data, MELANIE LAU, M.D.'s most frequently prescribed drugs include Estradiol, Valacyclovir, Prolia. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MELANIE LAU, M.D. accept Medicare?
MELANIE LAU, M.D. appears in CMS Medicare data with 118 Part D claims and 57 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MELANIE LAU, M.D.'s credentials?
MELANIE LAU, M.D.'s NPI is 1538200142 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

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