Dr. Douglas J. Parker, MD
- Medicare services, 2024
- 418
- Medicare patients, 2024
- 394
- Part D claims, 2024
- 265
- Hospital affiliations
- 2
- Industry payments
- $13
- Practice address
- 1233 N 30th St, Billings, MT 59101
- Practice phone
- Call (406) 237-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St Vincent Healthcare
Billings, Montana
Find Dr. Parker'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. Douglas J. Parker is an emergency medicine physician in Billings, Montana
Dr. Parker practices at St Vincent Healthcare in Billings, Montana.
Dr. Parker's NPI, 1134137045, was assigned on August 4, 2006. Dr. Parker graduated from Stanford University School of Medicine in 1989. Dr. Parker holds Montana license 7190.
- NPI
- 1134137045NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0648465393
- NPI enumeration date
- August 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (406) 237-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Douglas J. Parker practices at St Vincent Healthcare in Billings, Montana
Dr. Parker's primary practice is St Vincent Healthcare, at 1233 N 30th St, Billings, MT 59101 in Yellowstone County. The practice phone is (406) 237-7000.
- St Vincent Healthcare1233 N 30th St, Billings, MT 59101 · Yellowstone CountyPhone(406) 237-7000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Douglas J. Parker is affiliated with 3 sites of care and 4 medical groups
Dr. Parker's primary practice is St Vincent Healthcare in Billings, Montana. Dr. Parker is also affiliated with St. Vincent Regional Hospital. The medical group on file is SCL Health Medical Group. Dmand AI also links Dr. Parker to 1 more hospital and 3 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Douglas J. Parker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Parker practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St Vincent Healthcare | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Douglas J. Parker is one of 245 emergency medicine physicians in Montana
Emergency medicine is Dr. Parker's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Parker is licensed in Montana.
Specialties and state licenses
- Emergency medicine, MontanaPrimary
Emergency medicine physicians near Dr. Parker
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. Douglas J. Parker billed Medicare for 418 services in 2024
CMS data shows 418 Medicare services from Dr. Parker across 4 procedure codes in 2024, for 394 Medicare patients. Medicare paid $45,674 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Parker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3982024: 4185%
Dr. Parker compared with the Montana median for emergency medicine physicians, 2024
- Dr. Parker
- Montana median
- Medicare services
- 418vs 30438% above
- Medicare patients
- 394vs 30230% above
- Part D claims
- 134vs 453.0 times
Medians across 269 emergency medicine physicians in Montana with Dmand AI profiles that report each measure.
Dr. Parker's most billed Medicare procedure codes, 2024
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. Parker and other emergency medicine physicians in Montana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Douglas J. Parker treated 394 Medicare patients in 2024, average age 73
CMS counts 394 Medicare patients who saw Dr. Parker in 2024. The largest group is 65 to 74, with 147 patients. 75% of them have high blood pressure, and 64% have high cholesterol. 18% are also on Medicaid. Their average risk score is 1.80, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Parker's median patient age at 73, with 59% women.
Dr. Parker's Medicare patients by age, 2024
Dr. Parker's Medicare patients by sex, 2024
- Women21555%
- Men17945%
Chronic conditions among Dr. Parker's Medicare patients, 2024
- High blood pressure75%
- High cholesterol64%
- Arthritis52%
- Mood disorders41%
- Diabetes39%
- Depression38%
- Anxiety37%
- Ischemic heart disease35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Parker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women59%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Douglas J. Parker wrote 265 Medicare Part D claims in 2024
In 2024, Dr. Parker wrote 265 Medicare Part D claims for 164 patients. 94% of them were for generic drugs. CMS names the drug for 134 of them, across 7 drugs with 11 or more claims each, at $927 in total drug cost. In 2023, CMS named 74 claims across 4 drugs.
Dr. Parker's Part D claims by kind of drug, 2024
- Generic250 claims94%
- Brand-name15 claims6%
Dr. Parker's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Parker's Part D claims, 2024
- Opioids23%61 of 265 claims
- Antibiotics32%84 of 265 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 742024: 13481%
Drugs named by CMS: 7 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Douglas J. Parker takes part in Medicare
Dr. Parker accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Douglas J. Parker received $13 in industry payments in 2020
CMS Open Payments shows 1 general payment to Dr. Parker from 1 drug or device company in 2020. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $13.
Companies that paid Dr. Parker the most, 2020 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Douglas J. Parker graduated from Stanford University School of Medicine
Dr. Parker graduated from Stanford University School of Medicine in 1989.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Douglas J. Parker'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 DataDmand AI Org Hierarchy 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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. Douglas J. Parker
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. Douglas J. Parker's NPI number?
Dr. Douglas J. Parker's NPI number is 1134137045. It was assigned on August 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Douglas J. Parker?
Dr. Douglas J. Parker is an emergency medicine physician in Billings, Montana. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Douglas J. Parker practice?
Dr. Parker practices at 1233 N 30th St, Billings, MT 59101. Dr. Parker's primary practice is St Vincent Healthcare in Billings, Montana. Dmand AI also links Dr. Parker to 1 hospital and 3 medical groups.
What is Dr. Douglas J. Parker's office phone number?
The practice phone on file for Dr. Parker is (406) 237-7000.
What is Dr. Douglas J. Parker's medical license number?
Dr. Parker holds Montana license 7190.
Which hospitals is Dr. Douglas J. Parker affiliated with?
Dr. Parker is affiliated with St. Vincent Regional Hospital. Dmand AI links Dr. Parker to 1 more hospital.
What medical group is Dr. Douglas J. Parker part of?
Dr. Parker is linked to SCL Health Medical Group. Dmand AI links Dr. Parker to 3 more medical groups.
Does Dr. Douglas J. Parker accept Medicare?
Yes. CMS data shows Dr. Parker billed Medicare for 418 services in 2024, and Dr. Parker accepts Medicare assignment.
How many Medicare patients does Dr. Douglas J. Parker see?
CMS counts 394 Medicare patients who saw Dr. Parker in 2024, with an average age of 73.
What services does Dr. Douglas J. Parker bill to Medicare?
In 2024, Dr. Parker's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and emergency department visit (99283).
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Where did Dr. Douglas J. Parker go to medical school?
Dr. Parker graduated from Stanford University School of Medicine in 1989.
What drugs does Dr. Douglas J. Parker prescribe most?
In 2024 Medicare Part D data, Dr. Parker's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Cephalexin and Cefuroxime.
Has Dr. Douglas J. Parker received payments from drug or device companies?
CMS Open Payments shows $13 in general payments to Dr. Parker from 1 company from 2020 to 2020. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Douglas J. Parker been practicing?
Dr. Parker graduated from medical school in 1989, 37 years ago.
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