Dr. Johnathan Ly, MD
- Medicare services, 2024
- 777
- Medicare patients, 2024
- 481
- Part D claims, 2024
- 328
- Hospital affiliations
- 3
- Medical groups
- 4
- Practice address
- 225 N Jackson Avenue, San Jose, CA 95116
- Practice phone
- Call (408) 259-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ly's professional email, personal email and mobile number
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Dr. Johnathan Ly is an emergency medicine physician in San Jose, California
Dr. Ly practices at Regional Medical Center in San Jose, California, part of County of Santa Clara, CA.
Dr. Ly's NPI, 1396123717, was assigned on May 18, 2015. Dr. Ly graduated from New York Medical College in 2015. Dr. Ly's New York license number on file is 292237.
- NPI
- 1396123717NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3274898242
- NPI enumeration date
- May 18, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (408) 259-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Johnathan Ly practices at Regional Medical Center in San Jose, California
Dr. Ly's primary practice is Regional Medical Center, at 225 N Jackson Avenue, San Jose, CA 95116 in Santa Clara County. The practice phone is (408) 259-5000.
- Regional Medical Center225 N Jackson Avenue, San Jose, CA 95116 · Santa Clara CountyPhone(408) 259-5000
Source: Dmand AI Affiliation Data
Dr. Johnathan Ly is affiliated with 6 sites of care and 4 medical groups
Dr. Ly's primary practice is Regional Medical Center in San Jose, California, part of County of Santa Clara, CA. Dr. Ly is also affiliated with Santa Clara Valley Medical Center. The medical group on file is County of Santa Clara Behavioral Health Services, Las Plumas Behavioral Health Clinic. Dmand AI also links Dr. Ly to 1 more hospital, 3 group practices and clinics and 3 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Johnathan Ly's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ly practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Regional Medical Center | Available with a free account |
| +5 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across County of Santa Clara, CA and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Johnathan Ly is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Ly's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Ly is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Ly's licenses on file in 5 states: New York, California, New Jersey, Pennsylvania and Massachusetts.
Specialties and state licenses
- Emergency medicine, New YorkPrimary
- California license
- New Jersey license
- Pennsylvania license
- Massachusetts license
Emergency medicine physicians near Dr. Ly
Counts of emergency medicine physicians 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. Johnathan Ly billed Medicare for 777 services in 2024
CMS data shows 777 Medicare services from Dr. Ly across 6 procedure codes in 2024, for 481 Medicare patients. Medicare paid $71,640 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Ly's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4942024: 4981%
- Tests and treatments
- 2023: 3072024: 22726%
- Imaging
- 2023: 752024: 5231%
Dr. Ly compared with the California median for emergency medicine physicians, 2024
- Dr. Ly
- California median
- Medicare services
- 777vs 2652.9 times
- Medicare patients
- 481vs 24398% above
- Part D claims
- 237vs 623.8 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Ly'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Johnathan Ly treated 481 Medicare patients in 2024, average age 73
CMS counts 481 Medicare patients who saw Dr. Ly in 2024. The largest group is 65 to 74, with 146 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 68% are also on Medicaid. Their average risk score is 2.65, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Ly's median patient age at 46, with 51% women.
Dr. Ly's Medicare patients by age, 2024
Dr. Ly's Medicare patients by sex, 2024
- Women27758%
- Men20442%
Chronic conditions among Dr. Ly's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes50%
- Arthritis45%
- Chronic kidney disease41%
- Ischemic heart disease40%
- Heart failure37%
- Mood disorders37%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ly's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 46
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Johnathan Ly wrote 328 Medicare Part D claims in 2024
In 2024, Dr. Ly wrote 328 Medicare Part D claims for 220 patients. 90% of them were for generic drugs. CMS names the drug for 237 of them, across 11 drugs with 11 or more claims each, at $1,658 in total drug cost. In 2023, CMS named 263 claims across 11 drugs.
Dr. Ly's Part D claims by kind of drug, 2024
- Generic294 claims90%
- Brand-name34 claims10%
Dr. Ly'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. Ly's Part D claims, 2024
- Antibiotics34%110 of 328 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: 2632024: 23710%
Drugs named by CMS: 11 in 2024, 11 in 2023.
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
How Dr. Johnathan Ly takes part in Medicare
Dr. Ly accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Johnathan Ly graduated from New York Medical College
Dr. Ly graduated from New York Medical College in 2015. Dr. Ly is a member of ACEP.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Johnathan Ly accepts plans from 1 insurance carrier
Dr. Ly is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Johnathan Ly's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Johnathan Ly
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. Johnathan Ly's NPI number?
Dr. Johnathan Ly's NPI number is 1396123717. It was assigned on May 18, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Johnathan Ly?
Dr. Johnathan Ly is an emergency medicine physician in San Jose, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Johnathan Ly practice?
Dr. Ly practices at 225 N Jackson Avenue, San Jose, CA 95116. Dr. Ly's primary practice is Regional Medical Center in San Jose, California, part of County of Santa Clara, CA. Dmand AI also links Dr. Ly to 1 hospital, 3 group practices and clinics and 3 medical groups.
What is Dr. Johnathan Ly's office phone number?
The practice phone on file for Dr. Ly is (408) 259-5000.
What is Dr. Johnathan Ly's medical license number?
Dr. Ly's New York license number on file is 292237, one of the licenses on file in 5 states.
Which states has Dr. Johnathan Ly been licensed in?
Dmand AI has state licenses on file for Dr. Ly in New York (2018 to 2021), California (2019 to 2025), New Jersey (2017 to 2021), Pennsylvania (2018 to 2021) and Massachusetts (2018 to 2020).
Which hospitals is Dr. Johnathan Ly affiliated with?
Dr. Ly practices at Regional Medical Center in San Jose, California. Dr. Ly is also affiliated with Santa Clara Valley Medical Center. Dmand AI links Dr. Ly to 1 more hospital.
What medical group is Dr. Johnathan Ly part of?
Dr. Ly is linked to County of Santa Clara Behavioral Health Services, Las Plumas Behavioral Health Clinic. Dmand AI links Dr. Ly to 3 more medical groups.
Does Dr. Johnathan Ly accept Medicare?
Yes. CMS data shows Dr. Ly billed Medicare for 777 services in 2024, and Dr. Ly accepts Medicare assignment.
How many Medicare patients does Dr. Johnathan Ly see?
CMS counts 481 Medicare patients who saw Dr. Ly in 2024, with an average age of 73.
Show 6 more questionsShow fewer questions
Is Dr. Johnathan Ly board certified?
Yes. Dr. Ly is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Johnathan Ly bill to Medicare?
In 2024, Dr. Ly's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and critical care (99291).
Where did Dr. Johnathan Ly go to medical school?
Dr. Ly graduated from New York Medical College in 2015.
What drugs does Dr. Johnathan Ly prescribe most?
In 2024 Medicare Part D data, Dr. Ly's most prescribed drugs by claims were Ibuprofen, Nitrofurantoin Mono-Macro and Amoxicillin-Clavulanate Potass.
How long has Dr. Johnathan Ly been practicing?
Dr. Ly graduated from medical school in 2015, 11 years ago.
What insurance does Dr. Johnathan Ly accept?
Dr. Ly is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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