Dr. Mark A. Chag, MD
- Medicare services, 2021
- 41
- Part D claims, 2021
- 42
- Industry payments
- $183
- Medical group
- 1
- State license
- 1
- Practice address
- 15 Hospital Dr, York, ME 03909
- Practice phone
- Call (603) 431-6011
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Medical group
Find Dr. Chag'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. Mark A. Chag is an OB-GYN in York, Maine
Dr. Chag practices with Harbour Women's Health, a medical group.
Dr. Chag's NPI, 1336179878, was assigned on July 3, 2006. Dr. Chag holds New Hampshire license 6723.
- NPI
- 1336179878NPI Registry (opens in a new tab)
- NPI enumeration date
- July 3, 2006
- NPI status
- Active
- Practice phone
- (603) 431-6011
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Mark A. Chag's practice address is in York, Maine
Dr. Chag's practice address in the NPI Registry is 15 Hospital Dr, York, ME 03909, in York County. The practice phone is (603) 431-6011.
- NPI Registry address15 Hospital Dr, York, ME 03909 · York CountyPhone(603) 431-6011
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark A. Chag is affiliated with 1 medical group
Dr. Chag is part of Harbour Women's Health, a medical group in Portsmouth, New Hampshire.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mark A. Chag's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chag practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Harbour Women's Health | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Harbour Women's Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark A. Chag is one of 172 OB-GYNs in Maine
Obstetrics and gynecology is Dr. Chag's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Chag is licensed in New Hampshire.
Specialties and state licenses
- Obstetrics and gynecology, New HampshirePrimary
OB-GYNs near Dr. Chag
Counts of OB-GYNs 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. Mark A. Chag billed Medicare for 41 services in 2021
CMS data shows 41 Medicare services from Dr. Chag across 2 procedure codes in 2021. Medicare paid $1,660 for them. Every service was in an office.
Dr. Chag's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Other services
- 2020: 602021: 4132%
- Office and hospital visits
- 2020: 262021: 0100%
Dr. Chag compared with the Maine median for OB-GYNs, 2021
- Dr. Chag
- Maine median
- Medicare services
- 41vs 3421% above
- Part D claims
- 42vs 3617% above
Medians across 174 OB-GYNs in Maine with Dmand AI profiles that report each measure.
Dr. Chag'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. Chag and other OB-GYNs in Maine.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark A. Chag's patients have a median age of 57
Across all payers, Dmand AI patient panel data puts Dr. Chag's median patient age at 57, with 100% women.
Dr. Chag's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Mark A. Chag wrote 42 Medicare Part D claims in 2021
In 2021, Dr. Chag wrote 42 Medicare Part D claims. They cover 2 drugs, with $1,850 in total drug cost. In 2020, CMS named 43 claims across 2 drugs.
Dr. Chag'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: 432021: 422%
Drugs named by CMS: 2 in 2021, 2 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
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Dr. Mark A. Chag received $183 in industry payments from 2016 to 2019
CMS Open Payments shows 10 general payments to Dr. Chag from 6 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Allergan Inc. paid the most, $62.
General payments to Dr. Chag by program year, 2016 to 2019
Companies that paid Dr. Chag the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mark A. Chag'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 | Dmand 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 |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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. Mark A. Chag
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. Mark A. Chag's NPI number?
Dr. Mark A. Chag's NPI number is 1336179878. It was assigned on July 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark A. Chag?
Dr. Mark A. Chag is an OB-GYN in York, Maine. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Mark A. Chag practice?
Dr. Chag practices at 15 Hospital Dr, York, ME 03909. Dr. Chag's primary practice is Harbour Women's Health, a medical group.
What is Dr. Mark A. Chag's office phone number?
The practice phone on file for Dr. Chag is (603) 431-6011.
What is Dr. Mark A. Chag's medical license number?
Dr. Chag holds New Hampshire license 6723.
What medical group is Dr. Mark A. Chag part of?
Dr. Chag is part of Harbour Women's Health in Portsmouth, New Hampshire.
Does Dr. Mark A. Chag accept Medicare?
Yes. CMS data shows Dr. Chag billed Medicare for 41 services in 2021.
What services does Dr. Mark A. Chag bill to Medicare?
In 2021, Dr. Chag's most billed Medicare services were medicare service (G0101) and medicare temporary code (Q0091).
What drugs does Dr. Mark A. Chag prescribe most?
In 2021 Medicare Part D data, Dr. Chag's most prescribed drugs by claims were Estradiol and Progesterone.
Has Dr. Mark A. Chag received payments from drug or device companies?
CMS Open Payments shows $183 in general payments to Dr. Chag from 6 companies from 2016 to 2019. The largest total came from Allergan Inc.
How long has Dr. Mark A. Chag been practicing?
Dr. Chag's NPI was assigned in 2006.
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