Cassandra N. Mackey, MD
Emergency Medicine Physician · Worcester, MA
Cassandra N. Mackey, MD is an emergency medicine physician with a practice address in Worcester, Massachusetts, and NPI 1578927554, issued on Apr 6, 2016. Check the license (Massachusetts 282315, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Cassandra N. Mackey
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 282315 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Lake Ave N, Worcester, MA 01655
- Phone
- (508) 421-1400
- Enumerated
- Apr 6, 2016
- Record last updated
- Nov 24, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (508) 421-1490
- Medicaid ID
- 110160397A MA
- Medicare enrollment
- Enrolled (PECOS I20200323001955); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 2016
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,829 in Massachusetts → Look up another NPI →
Also registered at 55 Lake Ave N
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Cassandra N. Mackey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 282315Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average emergency medicine physician in 2024
65 Medicare Part D claims for 47 beneficiaries, against an average of 226 among the 54,106 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): 97 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
- Umass Memorial Medical Group IncWorcester, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cassandra N. Mackey among 1,829 emergency medicine physician records in Massachusetts
Cassandra N. Mackey, MD is one of 1,829 emergency medicine physician records with a practice address in Massachusetts. 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 2016, is newer than 73% of them.
- NPI issued2016 · 73% of these records are older, 23% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2016 · median 2011 among the 1,200 with a school on file
- Record last updated2020 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
216 emergency medicine physician records list a practice address in Worcester
They are 216 of the 13,166 NPPES records with a practice address in Worcester, and 1,829 emergency medicine physician records in Massachusetts.
All 1,829 in Massachusetts → Every provider in Worcester → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Steven Bird, MDWorcester, MA 016551174514863
- Tara Brigham, MDWorcester, MA 016551457342172
- Michael Butler, MDWorcester, MA 016551558352922
- Chad Darling, MDWorcester, MA 016551174514798
- Eric Dickson, MDWorcester, MA 016551851385611
- Gayle Galletta, MDWorcester, MA 016551831172055
- Romolo Gaspari, MDWorcester, MA 016551023091261
- Julianne Huber, MDWorcester, MA 016551295723310
Common questions
What is Cassandra N. Mackey, MD's NPI number?
Cassandra N. Mackey, MD's National Provider Identifier (NPI) is 1578927554, issued on Apr 6, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Cassandra N. Mackey, MD located?
The NPPES record lists a practice address at 55 Lake Ave N, Worcester, MA, 01655. Phone: (508) 421-1400. Providers update this record themselves, so call before visiting.
How can I verify Cassandra N. Mackey, MD's license?
NPPES lists Massachusetts license number 282315, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cassandra N. Mackey, MD prescribe under Medicare Part D?
In 2024, Cassandra N. Mackey, MD had 65 Medicare Part D claims for 47 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Cassandra N. Mackey, MD's MIPS final score?
The 2023 MIPS final score is 97 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.