Richard S. Irwin, MD
Pulmonary Disease Physician · Worcester, MA
Richard S. Irwin, MD is a pulmonary disease physician with a practice address in Worcester, Massachusetts, and NPI 1619950722, issued on Nov 22, 2005. Check the license (Massachusetts 43633, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Richard S. Irwin
- Credential
- MD
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- 43633 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Lake Ave N, Worcester, MA 01655
- Phone
- (508) 856-1919
- Enumerated
- Nov 22, 2005
- Record last updated
- Nov 13, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (508) 856-3999
- Medicaid ID
- 110038013A MA
- Medicare enrollment
- Enrolled (PECOS I20060419000549); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1968
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 569 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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- Amarys Abadie, CRNACertified Registered Nurse Anesthetist1992936843
- Paula Abate, NPNurse Practitioner1336265909
- Aly AbayazeedDiagnostic Radiology Physician1821221946
- Zainab AbbasDermatology Physician1609028000
- Mary-Alice Abbott, MDClinical Genetics (M.D.) Physician1982799417
Verify Richard S. Irwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 43633Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% fewer Medicare Part D claims than the average pulmonary disease physician in 2024
998 Medicare Part D claims for 152 beneficiaries, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims. 16 claims were for opioids.
Most prescribed
- Prednisone158 claims
- Albuterol Sulfate Hfa63 claims
- Famotidine61 claims
- Ipratropium Bromide58 claims
- Azithromycin57 claims
- Montelukast Sodium43 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 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).
Richard S. Irwin among 569 pulmonary disease physician records in Massachusetts
Richard S. Irwin, MD is one of 569 pulmonary disease 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1968 · median 2003 among the 407 with a school on file
- Record last updated2020 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in Massachusetts
There are 569 pulmonary disease physician records in Massachusetts.
All 569 in Massachusetts → Every provider in Worcester → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Kimberly Fisher, M.D.Worcester, MA 016551659399954
- Scott Kopec, M.D.Worcester, MA 016551437132545
- Hardy Kornfeld, M.D.Worcester, MA 016551124000377
- Stephen Krinzman, M.D.Worcester, MA 016551003898420
- Craig Lilly, M.D.Worcester, MA 016551639139298
- John Madison, M.D.Worcester, MA 016551821070244
- Paulo Oliveira, M.D.Worcester, MA 016551467412122
- Anna Rudnicki, MDWorcester, MA 016551750334736
Common questions
What is Richard S. Irwin, MD's NPI number?
Richard S. Irwin, MD's National Provider Identifier (NPI) is 1619950722, issued on Nov 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Richard S. Irwin, MD located?
The NPPES record lists a practice address at 55 Lake Ave N, Worcester, MA, 01655. Phone: (508) 856-1919. Providers update this record themselves, so call before visiting.
How can I verify Richard S. Irwin, MD's license?
NPPES lists Massachusetts license number 43633, 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 Richard S. Irwin, MD prescribe under Medicare Part D?
In 2024, Richard S. Irwin, MD had 998 Medicare Part D claims for 152 beneficiaries; the average among pulmonary disease physician prescribers was 1,425. Part D covers Medicare prescriptions only.
What is Richard S. Irwin, 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.