Clarissa Lauren Williams
Family Nurse Practitioner · Chicago, IL
Clarissa Lauren Williams is a family nurse practitioner with a practice address in Chicago, Illinois, and NPI 1619648334, issued on Sep 22, 2021. Check the license (Illinois 209024051, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Clarissa Lauren Williams
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License numbers
- 209024051 IL
28213693A IN
71011689A IN
Self-reported in NPPES; status is on the state search - Practice location
- 1801 W Taylor St Ste 3D, Chicago, IL 60612
- Phone
- (866) 600-2273
- Enumerated
- Sep 22, 2021
- Record last updated
- Feb 6, 2025
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 7,639 in Illinois → Look up another NPI →
Also registered at 1801 W Taylor St Ste 3D
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ayema HaqueRheumatology Physician1871280156
Verify Clarissa Lauren Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 209024051Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average family nurse practitioner in 2024
457 Medicare Part D claims for 138 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Prednisone91 claims
- Methotrexate84 claims
- Hydroxychloroquine Sulfate65 claims
- Methylprednisolone30 claims
- Colchicine18 claims
- Allopurinol16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 87.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $86.57
3 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Clarissa Lauren Williams among 7,639 family nurse practitioner records in Illinois
Clarissa Lauren Williams is one of 7,639 family nurse practitioner records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 65% of them.
- NPI issued2021 · 65% of these records are older, 28% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2025 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,567 family nurse practitioner records list a practice address in Chicago
They are 1,567 of the 63,379 NPPES records with a practice address in Chicago, and 7,639 family nurse practitioner records in Illinois.
All 7,639 in Illinois → Every provider in Chicago → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
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- Cynthia Davis, FNPChicago, IL 606121902897028
- Karen Davis, NPChicago, IL 606121740243997
- Marie Digiacomo, NPChicago, IL 606121164435269
- Lauren Foster, CNPChicago, IL 606121376515379
- Patricia Knowles, APN, NP-CChicago, IL 606121912927062
- Sarah Lau, APNChicago, IL 606121548254378
- Christine Maclean, NPCChicago, IL 606121740210004
Common questions
What is Clarissa Lauren Williams's NPI number?
Clarissa Lauren Williams's National Provider Identifier (NPI) is 1619648334, issued on Sep 22, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Clarissa Lauren Williams located?
The NPPES record lists a practice address at 1801 W Taylor St Ste 3D, Chicago, IL, 60612. Phone: (866) 600-2273. Providers update this record themselves, so call before visiting.
How can I verify Clarissa Lauren Williams's license?
NPPES lists Illinois license number 209024051, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Clarissa Lauren Williams prescribe under Medicare Part D?
In 2024, Clarissa Lauren Williams had 457 Medicare Part D claims for 138 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
What is Clarissa Lauren Williams's MIPS final score?
The 2023 MIPS final score is 87.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.