Dr. William S. Lim, MD
- Medicare services, 2022
- 12
- Medicare patients, 2024
- 15
- Part D claims, 2024
- 2,157
- Hospital affiliations
- 1
- Industry payments
- $998
- Practice address
- 10800 Magnolia Avenue, Riverside, CA 92505
- Practice phone
- Call (951) 353-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Lim's professional email, personal email and mobile number
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Dr. William S. Lim is an ophthalmologist in Riverside, California
Dr. Lim practices at Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
Dr. Lim's NPI, 1023107380, was assigned on October 12, 2006. Dr. Lim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1999. Dr. Lim holds California license A99969.
- NPI
- 1023107380NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5496833782
- NPI enumeration date
- October 12, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (951) 353-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William S. Lim practices at Riverside Medical Center in Riverside, California
Dr. Lim's primary practice is Riverside Medical Center, at 10800 Magnolia Avenue, Riverside, CA 92505 in Riverside County. The practice phone is (951) 353-2000.
- Riverside Medical Center10800 Magnolia Avenue, Riverside, CA 92505 · Riverside CountyPhone(951) 353-2000
Source: Dmand AI Affiliation Data
Dr. William S. Lim is affiliated with 1 site of care and 1 medical group
Dr. Lim's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William S. Lim's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lim practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Riverside Medical Center | 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 Kaiser Permanente and 6.2K+ hospitals, with verified contacts in the same login.
Dr. William S. Lim is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Lim's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Lim is board certified in ophthalmology by the American Board of Ophthalmology. Dr. Lim is licensed in California.
Specialties and state licenses
- Ophthalmology, CaliforniaPrimary
Clinical focus
Dmand AI lists cataract surgery with lens implant, glaucoma and vision problems among the conditions Dr. Lim treats.
Ophthalmologists near Dr. Lim
Counts of ophthalmologists 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. William S. Lim billed Medicare for 12 services in 2022
CMS data shows 12 Medicare services from Dr. Lim across 1 procedure code in 2022, all of them office visits, for 15 Medicare patients. Medicare paid $702 for them. Every service was in an office.
Dr. Lim compared with the California median for ophthalmologists, 2022
- Dr. Lim
- California median
- Medicare services
- 12vs 1,07999% below
- Medicare patients
- 15vs 42196% below
- Part D claims
- 2,083vs 6183.4 times
Medians across 2,568 ophthalmologists in California with Dmand AI profiles that report each measure.
Dr. Lim's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Lim?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lim and other ophthalmologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William S. Lim treated 15 Medicare patients in 2024, average age 67
CMS counts 15 Medicare patients who saw Dr. Lim in 2024. Their average risk score is 1.27, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Lim's median patient age at 64, with 58% women.
Dr. Lim's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William S. Lim wrote 2,157 Medicare Part D claims in 2024
In 2024, Dr. Lim wrote 2,157 Medicare Part D claims for 551 patients. 79% of them were for generic drugs. CMS names the drug for 2,083 of them, across 11 drugs with 11 or more claims each, at $74,106 in total drug cost. In 2023, CMS named 1,892 claims across 13 drugs.
Dr. Lim's Part D claims by kind of drug, 2024
- Generic1,700 claims79%
- Brand-name457 claims21%
Dr. Lim'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. Lim's Part D claims, 2024
- Antibiotics1%22 of 2,157 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: 1,8922024: 2,08310%
Drugs named by CMS: 11 in 2024, 13 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. William S. Lim takes part in Medicare
Dr. Lim accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Cataract surgery: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. William S. Lim received $998 in industry payments from 2016 to 2025
CMS Open Payments shows 12 general payments to Dr. Lim from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Abbott Laboratories paid the most, $342.
General payments to Dr. Lim by program year, 2016 to 2025
General payments to Dr. Lim by kind, 2016 to 2025
- Food and beverage$98198%
- Gifts$172%
Companies that paid Dr. Lim the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William S. Lim has 1 award and honors on record
Dmand AI lists 1 award for Dr. Lim, most recently CMS Stage 1 2012 in 2011.
Awards and honors for Dr. Lim
- 2011
- CMS Stage 1 2012
Source: Dmand AI Professional Profile Data
Dr. William S. Lim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science
Dr. Lim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1999.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. William S. Lim accepts plans from 2 insurance carriers
Dr. Lim is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Lim accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. William S. Lim'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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. William S. Lim
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. William S. Lim's NPI number?
Dr. William S. Lim's NPI number is 1023107380. It was assigned on October 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William S. Lim?
Dr. William S. Lim is an ophthalmologist in Riverside, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. William S. Lim practice?
Dr. Lim practices at 10800 Magnolia Avenue, Riverside, CA 92505. Dr. Lim's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
What is Dr. William S. Lim's office phone number?
The practice phone on file for Dr. Lim is (951) 353-2000.
What is Dr. William S. Lim's medical license number?
Dr. Lim holds California license A99969.
Which hospitals is Dr. William S. Lim affiliated with?
Dr. Lim practices at Riverside Medical Center in Riverside, California.
What medical group is Dr. William S. Lim part of?
Dr. Lim is linked to Southern California Permanente Medical Group.
Does Dr. William S. Lim accept Medicare?
Yes. CMS data shows Dr. Lim billed Medicare for 12 services in 2022, and Dr. Lim accepts Medicare assignment.
How many Medicare patients does Dr. William S. Lim see?
CMS counts 15 Medicare patients who saw Dr. Lim in 2024, with an average age of 67.
Is Dr. William S. Lim board certified?
Yes. Dr. Lim is board certified in ophthalmology by the American Board of Ophthalmology.
Show 6 more questionsShow fewer questions
What services does Dr. William S. Lim bill to Medicare?
In 2022, Dr. Lim's most billed Medicare services were office visit, established patient (99214).
Where did Dr. William S. Lim go to medical school?
Dr. Lim graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science in 1999.
What drugs does Dr. William S. Lim prescribe most?
In 2024 Medicare Part D data, Dr. Lim's most prescribed drugs by claims were Latanoprost, Dorzolamide-Timolol and Prednisolone Acetate.
Has Dr. William S. Lim received payments from drug or device companies?
CMS Open Payments shows $998 in general payments to Dr. Lim from 5 companies from 2016 to 2025. The largest total came from Abbott Laboratories.
How long has Dr. William S. Lim been practicing?
Dr. Lim graduated from medical school in 1999, 27 years ago.
What insurance does Dr. William S. Lim accept?
Dr. Lim is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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