Dr. Kelly Wei Wei Koay, MD

  • Baltimore, MD
  • Internist
NPI1497975809PAC ID7618062043
Medicare services, 2024
952
Medicare patients, 2024
228
Part D claims, 2024
3,698
Publications
1
Hospital affiliations
2
Practice address
600 N Wolfe St, Baltimore, MD 21287
Practice phone
Call (855) 662-3017
Professional email
Get professional email
Personal email
Get personal email
Mobile number
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Social profiles

Primary practice

Johns Hopkins Hospital Nelson/Harvey Building

Baltimore, Maryland

See all 10 affiliations

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Dr. Kelly Wei Wei Koay is an internist in Baltimore, Maryland

Dr. Koay practices at Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland.

Dr. Koay's NPI, 1497975809, was assigned on April 26, 2007. Dr. Koay graduated from WashU Medicine in 2003. Dr. Koay's Georgia license number on file is 58977.

NPI and contact details
Medicare PAC ID
7618062043
NPI enumeration date
April 26, 2007
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(855) 662-3017
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Female
Estimated age
49
Medical school graduation
2003

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Kelly Wei Wei Koay practices at Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland

Dr. Koay's primary practice is Johns Hopkins Hospital Nelson/Harvey Building, at 600 N Wolfe St, Baltimore, MD 21287 in Baltimore City. The practice phone is (855) 662-3017.

  • Johns Hopkins Hospital Nelson/Harvey Building
    600 N Wolfe St, Baltimore, MD 21287 · Baltimore CityPhone(855) 662-3017

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Dr. Kelly Wei Wei Koay is affiliated with 8 sites of care and 2 medical groups

Dr. Koay's primary practice is Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland. Dr. Koay is also affiliated with The Johns Hopkins Hospital. The medical group on file is Johns Hopkins Community Physicians. Dmand AI also links Dr. Koay to 1 more hospital, 3 home health agencies, 2 group practices and clinics and 1 medical group, each named with a free account.

See all 10 affiliations for Dr. Koay

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data

Dmand AI tracks the EHR system at Dr. Kelly Wei Wei Koay's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Koay practices, 7 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Johns Hopkins Hospital Nelson/Harvey BuildingAvailable with a free account
+7 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Kelly Wei Wei Koay is one of 3,320 internists in Maryland

Internal medicine is Dr. Koay's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Koay is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Koay's licenses on file in 4 states: Georgia, Maryland, Tennessee and North Carolina.

Specialties and state licenses

  • Internal medicine, GeorgiaPrimaryLicense 58977 · 2007 to 2010 · taxonomy 207R00000X
  • Maryland license2016 to 2026
  • Tennessee license2010 to 2018
  • North Carolina license2003 to 2007

Clinical focus

Dmand AI lists acid reflux, alzheimer's disease, aneurysm, arthritis, asthma, atrial fibrillation and flutter, chronic anemia and chronic diabetes among the conditions Dr. Koay treats.

Internists near Dr. Koay

Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Kelly Wei Wei Koay billed Medicare for 952 services in 2024

CMS data shows 952 Medicare services from Dr. Koay across 12 procedure codes in 2024, for 228 Medicare patients. Medicare paid $58,478 for them. Every service was in an office.

Medicare services, 2024952
Medicare patients228
Paid by Medicare$58,478
Procedure codes12

Dr. Koay's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 3322024: 40321%
Other services
2023: 2352024: 34547%
Tests and treatments
2023: 1082024: 16452%
Lab and pathology
2023: 362024: 4011%

Dr. Koay compared with the Maryland median for internists, 2024

  • Dr. Koay
  • Maryland median
Medicare services
952vs 65645% above
Medicare patients
228vs 2519% below
Part D claims
3,119vs 30910.1 times

Medians across 3,215 internists in Maryland with Dmand AI profiles that report each measure.

Dr. Koay's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Koay

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Kelly Wei Wei Koay treated 228 Medicare patients in 2024, average age 70

CMS counts 228 Medicare patients who saw Dr. Koay in 2024. The largest group is 65 to 74, with 123 patients. 71% of them have high blood pressure, and 71% have high cholesterol. 14% are also on Medicaid. Their average risk score is 1.09, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Koay's median patient age at 62, with 67% women.

Medicare patients, 2024228
Average age70
Average risk score1.09
Also on Medicaid14%

Dr. Koay's Medicare patients by age, 2024

Dr. Koay's Medicare patients by sex, 2024

  • Women15769%
  • Men7131%

Chronic conditions among Dr. Koay's Medicare patients, 2024

  1. High blood pressure71%
  2. High cholesterol71%
  3. Arthritis44%
  4. Diabetes29%
  5. Anxiety27%
  6. Mood disorders25%
  7. Chronic kidney disease24%
  8. Ischemic heart disease22%

Share of Medicare patients with each condition. A patient can have several.

Dr. Koay's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 62

Patient panel by sex, all payers

  • Women67%
  • Men32%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Kelly Wei Wei Koay wrote 3,698 Medicare Part D claims in 2024

In 2024, Dr. Koay wrote 3,698 Medicare Part D claims for 296 patients. 87% of them were for generic drugs. CMS names the drug for 3,119 of them, across 69 drugs with 11 or more claims each, at $364,796 in total drug cost. In 2023, CMS named 3,207 claims across 76 drugs.

Part D claims, 20243,698
Drugs named by CMS69
Total drug cost$364,796
Part D patients296

Dr. Koay's Part D claims by kind of drug, 2024

  • Generic3,223 claims87%
  • Brand-name456 claims12%
  • Other19 claims1%

Dr. Koay's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in Dr. Koay's Part D claims, 2024

  • Antibiotics1%23 of 3,698 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 3,2072024: 3,1193%

Drugs named by CMS: 69 in 2024, 76 in 2023.

See all prescribing by Dr. Koay

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. Kelly Wei Wei Koay offers telehealth to Medicare patients

Dr. Koay accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Koay as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Source: Doctors and Clinicians National Downloadable File (CMS)

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Dr. Kelly Wei Wei Koay has 1 publication on record

Dmand AI links 1 paper to Dr. Koay. Dr. Koay's most frequent co-authors are Jimmy Chamtsum Lu, MD, Angelo S. Milazzo, MD and Christian Boyd Ramers, MD.

Papers1

Dr. Koay's most frequent co-authors

Recent publications by Dr. Koay

See all 1 publications and co-authors

See who Dr. Koay researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Koay works with, so you can find a warm path to the right internists.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Kelly Wei Wei Koay received $105 in industry payments in 2016

CMS Open Payments shows 6 general payments to Dr. Koay from 3 drug and device companies in 2016. Food and beverage make up the largest share, 100% of the total. Alkermes, Inc. paid the most, $71.

Companies that paid Dr. Koay the most, 2016 to 2016

Share is of all general payments to this clinician.

See all payments to Dr. Koay

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Kelly Wei Wei Koay has 1 award and honors on record

Dmand AI lists 1 award for Dr. Koay.

Awards and honors for Dr. Koay

  1. Undated
    • AAP Fellow

Source: Dmand AI Professional Profile Data

Dr. Kelly Wei Wei Koay graduated from WashU Medicine

Dr. Koay graduated from WashU Medicine in 2003. Dr. Koay is a member of AAP and ACP.

  1. Medical schoolWashU Medicine
  2. Board certified in internal medicineAmerican Board of Internal Medicine
  3. Board certified in pediatricsAmerican Board of Pediatrics

Source: Dmand AI Professional Profile Data

Dr. Kelly Wei Wei Koay accepts plans from 6 insurance carriers

Dr. Koay is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. HMO plans come from the most carriers, 4. Check the plan with the practice before a visit.

  • Aetna
  • Blue Cross Blue Shield of Michigan
  • United Healthcare
  • Cigna
  • Blue Cross and Blue Shield of Kansas City
  • CMS Medicare

Plan types Dr. Koay accepts, by number of carriers

  1. HMO4
  2. Medicare4
  3. POS3
  4. EPO2
  5. PPO2

Source: Dmand AI Insurance Network Data

Sources for Dr. Kelly Wei Wei Koay's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Kelly Wei Wei Koay

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. Kelly Wei Wei Koay's NPI number?

Dr. Kelly Wei Wei Koay's NPI number is 1497975809. It was assigned on April 26, 2007, and it is active in the NPI Registry.

What kind of doctor is Dr. Kelly Wei Wei Koay?

Dr. Kelly Wei Wei Koay is an internist in Baltimore, Maryland. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).

Where does Dr. Kelly Wei Wei Koay practice?

Dr. Koay practices at 600 N Wolfe St, Baltimore, MD 21287. Dr. Koay's primary practice is Johns Hopkins Hospital Nelson/Harvey Building in Baltimore, Maryland. Dmand AI also links Dr. Koay to 1 hospital, 3 home health agencies, 2 group practices and clinics and 1 medical group.

What is Dr. Kelly Wei Wei Koay's office phone number?

The practice phone on file for Dr. Koay is (855) 662-3017.

What is Dr. Kelly Wei Wei Koay's medical license number?

Dr. Koay's Georgia license number on file is 58977, one of the licenses on file in 4 states.

Which states has Dr. Kelly Wei Wei Koay been licensed in?

Dmand AI has state licenses on file for Dr. Koay in Georgia (2007 to 2010), Maryland (2016 to 2026), Tennessee (2010 to 2018) and North Carolina (2003 to 2007).

Which hospitals is Dr. Kelly Wei Wei Koay affiliated with?

Dr. Koay is affiliated with The Johns Hopkins Hospital. Dmand AI links Dr. Koay to 1 more hospital.

What medical group is Dr. Kelly Wei Wei Koay part of?

Dr. Koay is linked to Johns Hopkins Community Physicians. Dmand AI links Dr. Koay to 1 more medical group.

Does Dr. Kelly Wei Wei Koay accept Medicare?

Yes. CMS data shows Dr. Koay billed Medicare for 952 services in 2024, and Dr. Koay accepts Medicare assignment.

Does Dr. Kelly Wei Wei Koay offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Koay as offering telehealth services.

Show 10 more questionsShow fewer questions

How many Medicare patients does Dr. Kelly Wei Wei Koay see?

CMS counts 228 Medicare patients who saw Dr. Koay in 2024, with an average age of 70.

Is Dr. Kelly Wei Wei Koay board certified?

Yes. Dr. Koay is board certified in internal medicine by the American Board of Internal Medicine.

What services does Dr. Kelly Wei Wei Koay bill to Medicare?

In 2024, Dr. Koay's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and medicare service (G0439).

Where did Dr. Kelly Wei Wei Koay go to medical school?

Dr. Koay graduated from WashU Medicine in 2003.

What drugs does Dr. Kelly Wei Wei Koay prescribe most?

In 2024 Medicare Part D data, Dr. Koay's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Amlodipine Besylate.

Has Dr. Kelly Wei Wei Koay received payments from drug or device companies?

CMS Open Payments shows $105 in general payments to Dr. Koay from 3 companies from 2016 to 2016. The largest total came from Alkermes, Inc.

How long has Dr. Kelly Wei Wei Koay been practicing?

Dr. Koay graduated from medical school in 2003, 23 years ago.

Does Dr. Kelly Wei Wei Koay do research?

Dmand AI links 1 publication to Dr. Koay.

Who does Dr. Kelly Wei Wei Koay publish with?

Dr. Koay's most frequent co-authors are Jimmy Chamtsum Lu, MD (1 shared paper), Angelo S. Milazzo, MD (1 shared paper) and Christian Boyd Ramers, MD (1 shared paper).

What insurance does Dr. Kelly Wei Wei Koay accept?

Dr. Koay is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. HMO plans come from the most carriers, 4. Check the plan with the practice before a visit.

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