Dr. Michael Louis Day, MD
- Medicare services, 2021
- 232
- Part D claims, 2021
- 122
- Hospital affiliations
- 1
- Industry payments
- $307
- Medical groups
- 3
- Practice address
- 300 Longwood Ave, Boston, MA 02115
- Practice phone
- Call (617) 355-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Boston Childrens Hospital
Boston, Massachusetts
Find Dr. Day's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Michael Louis Day is an emergency medicine physician in Boston, Massachusetts
Dr. Day practices at Boston Childrens Hospital in Boston, Massachusetts.
Dr. Day's NPI, 1457309361, was assigned on May 4, 2006. Dr. Day holds Ohio license 35077886D.
- NPI
- 1457309361NPI Registry (opens in a new tab)
- NPI enumeration date
- May 4, 2006
- NPI status
- Active
- Practice phone
- (617) 355-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Michael Louis Day practices at Boston Childrens Hospital in Boston, Massachusetts
Dr. Day's primary practice is Boston Childrens Hospital, at 300 Longwood Ave, Boston, MA 02115 in Suffolk County. The practice phone is (617) 355-6000.
- Boston Childrens Hospital300 Longwood Ave, Boston, MA 02115 · Suffolk CountyPhone(617) 355-6000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Michael Louis Day is affiliated with 3 sites of care and 3 medical groups
Dr. Day's primary practice is Boston Childrens Hospital in Boston, Massachusetts. Dr. Day is also affiliated with PeaceHealth Cottage Grove Community Medical Center. The medical group on file is PeaceHealth Internal Medicine. Dmand AI also links Dr. Day to 2 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Michael Louis Day's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Day practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Boston Childrens Hospital | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael Louis Day is one of 1,483 emergency medicine physicians in Massachusetts
Emergency medicine is Dr. Day's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Day is licensed in Ohio.
Specialties and state licenses
- Emergency medicine, OhioPrimary
Emergency medicine physicians near Dr. Day
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael Louis Day billed Medicare for 232 services in 2021
CMS data shows 232 Medicare services from Dr. Day across 3 procedure codes in 2021. Medicare paid $31,246 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Day's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 3872021: 23240%
Dr. Day compared with the Massachusetts median for emergency medicine physicians, 2021
- Dr. Day
- Massachusetts median
- Medicare services
- 232vs 34132% below
- Part D claims
- 122vs 363.4 times
Medians across 1,477 emergency medicine physicians in Massachusetts with Dmand AI profiles that report each measure.
Dr. Day's most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Day and other emergency medicine physicians in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael Louis Day wrote 122 Medicare Part D claims in 2021
In 2021, Dr. Day wrote 122 Medicare Part D claims. They cover 6 drugs, with $6,074 in total drug cost. In 2020, CMS named 150 claims across 6 drugs.
Dr. Day's most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 1502021: 12219%
Drugs named by CMS: 6 in 2021, 6 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Michael Louis Day received $307 in industry payments from 2016 to 2022
CMS Open Payments shows 7 general payments to Dr. Day from 5 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $130.
General payments to Dr. Day by program year, 2016 to 2022
Companies that paid Dr. Day the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Michael Louis Day's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Michael Louis Day
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael Louis Day's NPI number?
Dr. Michael Louis Day's NPI number is 1457309361. It was assigned on May 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Louis Day?
Dr. Michael Louis Day is an emergency medicine physician in Boston, Massachusetts. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Michael Louis Day practice?
Dr. Day practices at 300 Longwood Ave, Boston, MA 02115. Dr. Day's primary practice is Boston Childrens Hospital in Boston, Massachusetts. Dmand AI also links Dr. Day to 2 medical groups and 1 group practice or clinic.
What is Dr. Michael Louis Day's office phone number?
The practice phone on file for Dr. Day is (617) 355-6000.
What is Dr. Michael Louis Day's medical license number?
Dr. Day holds Ohio license 35077886D.
Which hospitals is Dr. Michael Louis Day affiliated with?
Dr. Day is affiliated with PeaceHealth Cottage Grove Community Medical Center.
What medical group is Dr. Michael Louis Day part of?
Dr. Day is linked to PeaceHealth Internal Medicine. Dmand AI links Dr. Day to 2 more medical groups.
Does Dr. Michael Louis Day accept Medicare?
Yes. CMS data shows Dr. Day billed Medicare for 232 services in 2021.
What services does Dr. Michael Louis Day bill to Medicare?
In 2021, Dr. Day's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and critical care (99291).
What drugs does Dr. Michael Louis Day prescribe most?
In 2021 Medicare Part D data, Dr. Day's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Cephalexin and Prednisone.
Has Dr. Michael Louis Day received payments from drug or device companies?
CMS Open Payments shows $307 in general payments to Dr. Day from 5 companies from 2016 to 2022. The largest total came from Stryker Corporation.
How long has Dr. Michael Louis Day been practicing?
Dr. Day's NPI was assigned in 2006.
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