Kaitlin E. Mastalerz, PA-C
Physician Assistant · Lake Forest, IL
Kaitlin E. Mastalerz, PA-C is a physician assistant with a practice address in Lake Forest, Illinois, and NPI 1023404886, issued on Apr 8, 2015. Check the license (Illinois 085.005883, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Kaitlin E. Mastalerz
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 085.005883 IL
Self-reported in NPPES; status is on the state search - Practice location
- 660 N Westmoreland RD, Lake Forest, IL 60045
- Phone
- (847) 234-5600
- Enumerated
- Apr 8, 2015
- Record last updated
- May 28, 2024
- Medicare enrollment
- Enrolled (PECOS I20160909000589); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,926 in Illinois → Look up another NPI →
Also registered at 660 N Westmoreland RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kathleen Abernathy, R.D., L.D.N.Registered Dietitian1295020063
- Sushma Anand, D.O.Obstetrics & Gynecology Physician1285950352
- Michael Ankin, M.D.Pulmonary Disease Physician1922117878
- Kristen Ballard, PT, DPTPhysical Therapist1700070497
- Amy Barnard, APNCritical Care Medicine Clinical Nurse Specialist1023420163
- Christina Baron, R.D.Registered Dietitian1770879397
Verify Kaitlin E. Mastalerz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 085.005883Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average physician assistant in 2024
117 Medicare Part D claims for 56 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
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 MIPS final score for 2023 (Medicare payment program): 94.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Northwestern Medical Faculty FoundationLake Forest, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kaitlin E. Mastalerz among 4,926 physician assistant records in Illinois
Kaitlin E. Mastalerz, PA-C is one of 4,926 physician assistant records with a practice address in Illinois. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 36% of them.
- NPI issued2015 · 36% of these records are older, 60% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2016 · median 2019 among the 3,407 with a school on file
- Record last updated2024 · 35% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
62 physician assistant records list a practice address in Lake Forest
They are 62 of the 821 NPPES records with a practice address in Lake Forest, and 4,926 physician assistant records in Illinois.
All 4,926 in Illinois → Every provider in Lake Forest → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Elizabeth Ciennik, PA-CLake Forest, IL 600451497160063
- Daniela Cvetkova, PALake Forest, IL 600451548534977
- Emily Friedman, PA-CLake Forest, IL 600451417232125
- Katherine Kovacic, PA-CLake Forest, IL 600451538386149
- Jaklyn Lynch, PA-CLake Forest, IL 600451689981029
- Kelly Muscavitch, PALake Forest, IL 600451679963821
- Jennafer Ottenheimer, PA-CLake Forest, IL 600451356753016
- Keely Pedersen, PA-CLake Forest, IL 600451619228624
Common questions
What is Kaitlin E. Mastalerz, PA-C's NPI number?
Kaitlin E. Mastalerz, PA-C's National Provider Identifier (NPI) is 1023404886, issued on Apr 8, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Kaitlin E. Mastalerz, PA-C located?
The NPPES record lists a practice address at 660 N Westmoreland RD, Lake Forest, IL, 60045. Phone: (847) 234-5600. Providers update this record themselves, so call before visiting.
How can I verify Kaitlin E. Mastalerz, PA-C's license?
NPPES lists Illinois license number 085.005883, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Kaitlin E. Mastalerz, PA-C prescribe under Medicare Part D?
In 2024, Kaitlin E. Mastalerz, PA-C had 117 Medicare Part D claims for 56 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Kaitlin E. Mastalerz, PA-C's MIPS final score?
The 2023 MIPS final score is 94.1 of 100. 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.