Mark D. Litchman, MD
Allergy & Immunology Physician · Norwalk, CT
Mark D. Litchman, MD is an allergy & immunology physician with a practice address in Norwalk, Connecticut, and NPI 1447341243, issued on Sep 27, 2006. Check the license (Connecticut 027828, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark D. Litchman
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- 027828 CT
Self-reported in NPPES; status is on the state search - Practice location
- 148 East Avenue, Norwalk, CT 06851
- Phone
- (203) 838-4034
- Enumerated
- Sep 27, 2006
- Record last updated
- Oct 8, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (203) 853-6361
- Medicaid ID
- 001278284 CT
- Medicare enrollment
- Enrolled (PECOS I20040304000259); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1984
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 57 in Connecticut → Look up another NPI →
Also registered at 148 East Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Audrey Bregante, APRN RN NPPediatric Nurse Practitioner1609967496
- Clifford Feller, MDObstetrics & Gynecology Physician1174581706
- Aymeric Louit, MDAllergy & Immunology Physician1881744456
- Libia Rueda-Matik, MDPediatrics Physician1053483578
- Joseph Sproviero, MD PHDAllergy & Immunology Physician1780775577
- Jesse Wexler, MDDiagnostic Radiology Physician1912972670
Verify Mark D. Litchman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 027828Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
241 Medicare Part D claims for 88 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 38% of claims.
Most prescribed
- Montelukast Sodium47 claims
- Epinephrine19 claims
- Albuterol Sulfate Hfa16 claims
- Prednisone16 claims
- Dupixent Pen13 claims
- Gabapentin13 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): 80.3 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: $26.61
1 payment: food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 2,496 providers of this specialty with any payment received $8,321.81 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
- Fairfield County Allergy Asthma And Immunology Associates PCGreenwich, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark D. Litchman among 57 allergy & immunology physician records in Connecticut
Mark D. Litchman, MD is one of 57 allergy & immunology physician records with a practice address in Connecticut. 79% 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 19% of them.
- NPI issued2006 · 19% of these records are older, 42% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated1984 · median 2002 among the 35 with a school on file
- Record last updated2020 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in Connecticut
There are 57 allergy & immunology physician records in Connecticut.
All 57 in Connecticut → Every provider in Norwalk → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Kaoru Harada, M.D.Norwalk, CT 068511215383864
- Philip Hemmers, D.O.Norwalk, CT 068511386700854
- Aymeric Louit, MDNorwalk, CT 068511881744456
- Agnieszka Matczuk, MDNorwalk, CT 068511467436733
- Joseph Sproviero, MD PHDNorwalk, CT 068511780775577
- Michael Lewin, MDNorwalk, CT 068501538100557
- Gary Soffer, MDGreenwich, CT 068301477991867
- Aimee Altschul-Latzman, M.D.Fairfield, CT 068241003855859
Common questions
What is Mark D. Litchman, MD's NPI number?
Mark D. Litchman, MD's National Provider Identifier (NPI) is 1447341243, issued on Sep 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark D. Litchman, MD located?
The NPPES record lists a practice address at 148 East Avenue, Norwalk, CT, 06851. Phone: (203) 838-4034. Providers update this record themselves, so call before visiting.
How can I verify Mark D. Litchman, MD's license?
NPPES lists Connecticut license number 027828, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark D. Litchman, MD prescribe under Medicare Part D?
In 2024, Mark D. Litchman, MD had 241 Medicare Part D claims for 88 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
What is Mark D. Litchman, MD's MIPS final score?
The 2023 MIPS final score is 80.3 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.