2026 NPPES data Neurodevelopmental Disabilities Physician NPI 1316956501 M,D., PH.D.
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GANG LIAN, M,D., PH.D.

Neurodevelopmental Disabilities Physician in ESSEX, Connecticut. 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
565
Medicare Part D claims · 95 beneficiaries · Neurodevelopmental Disabilities Physician avg: 1K
Generic prescribing
95%
generic claims · 5% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$191.56
7 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

GANG LIAN, M,D., PH.D. filed 565 Medicare Part D claims in 2023 as a Neurodevelopmental Disabilities Physician in ESSEX, Connecticut, prescribing 95% generic.

565
Part D claims, 2023
95%
generic prescribing
$191.56
industry payments (Sunshine Act)

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.

GANG LIAN, M,D., PH.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

565 Top 34% higher than 66% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). This entry sits in this band. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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-eligible specialty (heuristic — not verified)

GANG LIAN, M,D., PH.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about GANG LIAN, M,D., PH.D.?

Quality data not reported

NPI registry status

Active

Issued 08/05/2006

NPI 1316956501

Primary specialty

Neurodevelopmental Disabilities Physician

Rare

57 US NPIs in this specialty

Medicare Part D claims

565 54% vs specialty avg

2023 prescription claims

Specialty avg: 1,241

Specialty distribution in Connecticut

How Neurodevelopmental Disabilities Physician compares to other specialties among Connecticut providers

Connecticut providers

Neurodevelopmental Disabilities Physician share within Connecticut

1. Neurodevelopmental Disabilities Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Neurodevelopmental Disabilities Physician share within Connecticut

Specialty board-certification context

Estimated specialty board-certified rate — Neurodevelopmental Disabilities Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Neurodevelopmental Disabilities Physician ABMS/AOA estimate

Est. board-certified rate (Neurodevelopmental Disabilities Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Neurodevelopmental Disabilities Physician) — ABMS / AOA estimate

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).

GANG LIAN, M,D., PH.D. appears in the CMS NPPES registry as a Neurodevelopmental Disabilities Physician provider holding M,D., PH.D. credentials at 180 WESTBROOK RD, ESSEX, CT, 06426, with a listed phone of (860) 767-1034. NPI 1316956501 was issued on 08/05/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what LIAN 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 565 prescription claims written by this provider, covering 95 Medicare beneficiaries and totaling roughly $171K in drug spend, split 5% brand-name and 95% generic by claim count, with an opioid prescribing rate of 2.8%. 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.

Neurodevelopmental Disabilities Physician is a narrow specialty nationwide, with 57 enrolled providers across 26 states and an average of 1,241 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

180 WESTBROOK RD
ESSEX, CT 06426

Provider Details

NPI 1316956501
Specialty Neurodevelopmental Disabilities Physician
Credentials M,D., PH.D.
Gender Male
NPI Issued 08/05/2006

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 GANG LIAN, M,D., PH.D.. Source: openpaymentsdata.cms.gov.

Total received

$192

Largest payer

MDD US Operations, LLC

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 · Generic-heavy

GANG LIAN, M,D., PH.D. — brand share 5.0%
Specialty average (est.)

5% brand-name claims vs 95% generic, on 565 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.

565
Total Claims
$171K
Total Drug Cost
95
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,178
Total Day Supply
34,704
Brand vs Generic
5% brand / 95% generic
Brand Drug Cost
$116K
Generic Drug Cost
$55K
Opioid Claims
16 (2.8% rate)

Patient Demographics

Average Patient Age
71.7 years
Avg HCC Risk Score
1.45
Gender Split
56% female / 44% male
Age Distribution
<65: 15, 65-74: 43, 75-84: 26, 85+: 11

Top Prescribed Drugs (Medicare Part D)

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

What GANG LIAN, M,D., PH.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
Gabapentin
53
Topiramate
44
Levetiracetam
41
Pramipexole Dihydrochloride
Pramipexole Di-Hcl
39
Donepezil Hcl
37
Sumatriptan Succinate
31
Memantine Hcl
30
Clonazepam
22
Primidone
20
Levetiracetam Er
Levetiracetam
18

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

Neurodevelopmental Disabilities Physician Overview

How GANG LIAN, M,D., PH.D. fits within the Neurodevelopmental Disabilities Physician landscape nationally.

57
Neurodevelopmental Disabilities Physician Providers in US
26
States with Neurodevelopmental Disabilities Physician
1,241
Avg Claims per Provider

GANG LIAN, M,D., PH.D.'s 565 claims are below the specialty average of 1,241.

Frequently Asked Questions

What is GANG LIAN, M,D., PH.D.'s specialty?
GANG LIAN, M,D., PH.D. specializes in Neurodevelopmental Disabilities Physician and practices in ESSEX, Connecticut. Credentials: M,D., PH.D..
How much does GANG LIAN, M,D., PH.D. prescribe under Medicare Part D?
In 2023, GANG LIAN, M,D., PH.D. wrote 565 Medicare Part D claims totaling $171K in drug costs for 95 beneficiaries.
Where is GANG LIAN, M,D., PH.D. located?
GANG LIAN, M,D., PH.D. is located at 180 WESTBROOK RD, ESSEX, CT, 06426. Phone: (860) 767-1034.
What is GANG LIAN, M,D., PH.D.'s NPI number?
GANG LIAN, M,D., PH.D.'s National Provider Identifier (NPI) is 1316956501, issued on 08/05/2006.
Does GANG LIAN, M,D., PH.D. prescribe more brand-name or generic drugs?
GANG LIAN, M,D., PH.D.'s prescribing is 5% brand-name and 95% generic drugs by claim count, with $116K in brand drug costs.
Does GANG LIAN, M,D., PH.D. prescribe opioids?
Yes, GANG LIAN, M,D., PH.D. had 16 opioid claims in 2023 with an opioid prescribing rate of 2.8%.
How many Neurodevelopmental Disabilities Physician providers are there in the US?
There are 57 Neurodevelopmental Disabilities Physician providers across 26 states in the US. The average Neurodevelopmental Disabilities Physician provider writes 1,241 Medicare Part D claims per year.
What drugs does GANG LIAN, M,D., PH.D. prescribe most often?
Based on 2023 Medicare Part D data, GANG LIAN, M,D., PH.D.'s most frequently prescribed drugs include Gabapentin, Topiramate, Levetiracetam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does GANG LIAN, M,D., PH.D. accept Medicare?
GANG LIAN, M,D., PH.D. appears in CMS Medicare data with 565 Part D claims and 95 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify GANG LIAN, M,D., PH.D.'s credentials?
GANG LIAN, M,D., PH.D.'s NPI is 1316956501 with credentials M,D., PH.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.
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