Rhiannon Mazenis, PA-C
Physician Assistant · Oak Forest, IL
Rhiannon Mazenis, PA-C is a physician assistant with a practice address in Oak Forest, Illinois, and NPI 1669563805, issued on Sep 27, 2006. Check the license (Illinois 385001545, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Rhiannon Mazenis
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 385001545 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5320 159TH St, Oak Forest, IL 60452
- Phone
- (708) 798-8112
- Enumerated
- Sep 27, 2006
- Record last updated
- Apr 24, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (708) 535-6396
- Medicare enrollment
- Enrolled (PECOS I20061026000375); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,926 in Illinois → Look up another NPI →
Also registered at 5320 159TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Manisha Chheda, DDSDentist1649215393
- Lloyd Mayer, RPHPharmacist1518236330
- Hyun Oh, M.D.Orthopaedic Hand Surgery Physician1316972417
Verify Rhiannon Mazenis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 385001545Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.8 times the Medicare Part D claims of the average physician assistant in 2024
3,163 Medicare Part D claims for 425 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims. 1,652 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen817 claims
- Gabapentin432 claims
- Oxycodone-Acetaminophen351 claims
- Tramadol Hcl226 claims
- Pregabalin213 claims
- Tizanidine Hcl146 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.
Industry payments in 2024: $1,257.95
63 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 64,719 providers of this specialty with any payment received $841.65 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.
Bills Medicare through one group practice
- Premier Pain Specialists LLCSchaumburg, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rhiannon Mazenis among 4,926 physician assistant records in Illinois
Rhiannon Mazenis, 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 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 88% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2005 · median 2019 among the 3,407 with a school on file
- Record last updated2019 · 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).
3 physician assistant records list a practice address in Oak Forest
They are 3 of the 308 NPPES records with a practice address in Oak Forest, and 4,926 physician assistant records in Illinois.
All 4,926 in Illinois → Every provider in Oak Forest → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Cory Cunningham, PA-COak Forest, IL 604521932271913
- Sarah Posey, PA-COak Forest, IL 604521922661958
- Anuprit Ahuja, PA-COak Lawn, IL 604531043699184
- John Ancona, PAOak Lawn, IL 604531003891649
- Arkadiusz Baginski, PANew Lenox, IL 604511891684700
- Christina Caraballo, PA-COak Lawn, IL 604531295155646
- Jessica Dakhoul, PA-CNew Lenox, IL 604511932741824
- Elizabeth Dibella, PA-CNew Lenox, IL 604511093089120
Common questions
What is Rhiannon Mazenis, PA-C's NPI number?
Rhiannon Mazenis, PA-C's National Provider Identifier (NPI) is 1669563805, issued on Sep 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Rhiannon Mazenis, PA-C located?
The NPPES record lists a practice address at 5320 159TH St, Oak Forest, IL, 60452. Phone: (708) 798-8112. Providers update this record themselves, so call before visiting.
How can I verify Rhiannon Mazenis, PA-C's license?
NPPES lists Illinois license number 385001545, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Rhiannon Mazenis, PA-C prescribe under Medicare Part D?
In 2024, Rhiannon Mazenis, PA-C had 3,163 Medicare Part D claims for 425 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
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.