Christopher John Mastino, M.D.
Specialist · Fairfield, CT
Christopher John Mastino, M.D. is a specialist with a practice address in Fairfield, Connecticut, and NPI 1740230358, issued on May 12, 2006. Check the license (Connecticut 037809, as entered in NPPES) with the Connecticut board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Christopher John Mastino
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 037809 CT
Self-reported in NPPES; status is on the state search - Practice location
- 314 Riverside Drive, Fairfield, CT 06824
- Phone
- (203) 685-6326
- Enumerated
- May 12, 2006
- Record last updated
- Aug 6, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (203) 580-3366
- Medicare enrollment
- Enrolled (PECOS I20060714000189); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest specialist records → All 397 in Connecticut → Look up another NPI →
Verify Christopher John Mastino in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Connecticut board licenses this profession
Search for license 037809Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average specialist in 2024
1,154 Medicare Part D claims for 44 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 742 claims were for opioids.
Most prescribed
- Oxycodone Hcl332 claims
- Oxycontin102 claims
- Diazepam96 claims
- Oxycodone-Acetaminophen83 claims
- Morphine Sulfate Er66 claims
- Alprazolam65 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.
Christopher John Mastino among 397 specialist records in Connecticut
Christopher John Mastino, M.D. is one of 397 specialist records with a practice address in Connecticut. 25% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 55% newer
- In a Medicare fileYes · 25% of these records are
- In the CMS Doctors and Clinicians fileYes · 15% of these records are
- Graduated1994 · median 1990 among the 59 with a school on file
- Record last updated2018 · 81% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 specialist records list a practice address in Fairfield
They are 15 of the 1,446 NPPES records with a practice address in Fairfield, and 397 specialist records in Connecticut.
All 397 in Connecticut → Every provider in Fairfield → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Donna Alves, LCCC, LPCFairfield, CT 068241932594777
- Emil Blanco, MDFairfield, CT 068241134111040
- Nicole CallowayFairfield, CT 068241710262209
- Eddy CastilloFairfield, CT 068241225020134
- Gena Cobrin, MDFairfield, CT 068241205828126
- Edward Grossman, MDFairfield, CT 068241629060827
- Maria Horga, M.DFairfield, CT 068241154463404
- Richard Lopatin, MDFairfield, CT 068241598757403
Common questions
What is Christopher John Mastino, M.D.'s NPI number?
Christopher John Mastino, M.D.'s National Provider Identifier (NPI) is 1740230358, issued on May 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher John Mastino, M.D. located?
The NPPES record lists a practice address at 314 Riverside Drive, Fairfield, CT, 06824. Phone: (203) 685-6326. Providers update this record themselves, so call before visiting.
How can I verify Christopher John Mastino, M.D.'s license?
NPPES lists Connecticut license number 037809, as entered by the provider. Search the Connecticut board that licenses this profession; the NPPES record confirms identity only.
How much does Christopher John Mastino, M.D. prescribe under Medicare Part D?
In 2024, Christopher John Mastino, M.D. had 1,154 Medicare Part D claims for 44 beneficiaries; the average among specialist prescribers was 1,380. 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.