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Dr. Romeo Blas Mariano Jr., MD
NPI1639235831
- Medicare services, 2021
- 113
- Part D claims, 2024
- 357
- Publications
- 1
- Hospital affiliations
- 1
- Industry payments
- $471
- Practice address
- 3010 15th Avenue South, Great Falls, MT 59405
- Practice phone
- Call (406) 216-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Mariano'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. Romeo Blas Mariano Jr. is a psychiatrist in Great Falls, Montana
Dr. Mariano practices at Great Falls Hospital in Great Falls, Montana, part of Surgery Partners.
Dr. Mariano's NPI, 1639235831, was assigned on December 29, 2006. Dr. Mariano graduated from UC San Diego School of Medicine in 1990. Dr. Mariano holds California license G73692.
NPI and contact details
- NPI
- 1639235831NPI Registry (opens in a new tab)
- NPI enumeration date
- December 29, 2006
- NPI status
- Active
- Practice phone
- (406) 216-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Romeo Blas Mariano Jr. practices at Great Falls Hospital in Great Falls, Montana
Dr. Mariano's primary practice is Great Falls Hospital, at 3010 15th Avenue South, Great Falls, MT 59405 in Cascade County. The practice phone is (406) 216-8000.
- Great Falls Hospital3010 15th Avenue South, Great Falls, MT 59405 · Cascade CountyPhone(406) 216-8000
Source: Dmand AI Affiliation Data
Dr. Romeo Blas Mariano Jr. is affiliated with 1 site of care
Dr. Mariano's primary practice is Great Falls Hospital in Great Falls, Montana, part of Surgery Partners.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Romeo Blas Mariano Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mariano practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Great Falls Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Romeo Blas Mariano Jr. is one of 108 psychiatrists in Montana
Psychiatry is Dr. Mariano's primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Mariano is board certified in active through 2025 by the Psychiatry, CA. Dr. Mariano is licensed in California.
Specialties and state licenses
- Psychiatry, CaliforniaPrimary
Psychiatrists near Dr. Mariano
Counts of psychiatrists 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. Romeo Blas Mariano Jr. billed Medicare for 113 services in 2021
CMS data shows 113 Medicare services from Dr. Mariano across 3 procedure codes in 2021. Medicare paid $9,145 for them. Every service was in an office.
Medicare services, 2021113
Paid by Medicare$9,145
Procedure codes3
Dr. Mariano's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 2692021: 11358%
Dr. Mariano compared with the Montana median for psychiatrists, 2021
- Dr. Mariano
- Montana median
- Medicare services
- 113vs 17636% below
- Part D claims
- 176vs 24729% below
Medians across 124 psychiatrists in Montana with Dmand AI profiles that report each measure.
Dr. Mariano'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.
Need commercial claims for Dr. Mariano?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mariano and other psychiatrists in Montana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Romeo Blas Mariano Jr.'s patients have a median age of 48
Across all payers, Dmand AI patient panel data puts Dr. Mariano's median patient age at 48, with 54% women.
Dr. Mariano's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 48
Patient panel by sex, all payers
- Women54%
- Men46%
Source: Dmand AI Patient Panel Data
Dr. Romeo Blas Mariano Jr. wrote 357 Medicare Part D claims in 2024
In 2024, Dr. Mariano wrote 357 Medicare Part D claims for 20 patients. 92% of them were for generic drugs. CMS names the drug for 176 of them, across 8 drugs with 11 or more claims each, at $15,452 in total drug cost. In 2023, CMS named 278 claims across 13 drugs.
Part D claims, 2024357
Drugs named by CMS8
Total drug cost$15,452
Part D patients20
Dr. Mariano's Part D claims by kind of drug, 2024
- Generic327 claims92%
- Brand-name and other30 claims8%
Dr. Mariano'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2782024: 17637%
Drugs named by CMS: 8 in 2024, 13 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
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Dr. Romeo Blas Mariano Jr. has 1 publication on record
Dmand AI links 1 paper to Dr. Mariano. Dr. Mariano's most frequent co-author is William James Lewis, MD.
Papers1
Dr. Mariano's most frequent co-authors
Recent publications by Dr. Mariano
See who Dr. Mariano researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Mariano works with, so you can find a warm path to the right psychiatrists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Romeo Blas Mariano Jr. received $471 in industry payments from 2016 to 2020
CMS Open Payments shows 29 general payments to Dr. Mariano from 7 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 93% of the total. Janssen Pharmaceuticals, Inc paid the most, $193.
General payments to Dr. Mariano by program year, 2016 to 2020
General payments to Dr. Mariano by kind, 2016 to 2020
$471in total
- Food and beverage$43993%
- Education$327%
Companies that paid Dr. Mariano the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Romeo Blas Mariano Jr. graduated from UC San Diego School of Medicine
Dr. Mariano graduated from UC San Diego School of Medicine in 1990. Dr. Mariano is a member of AMA, APA, CMA, Monterey County Medical Society and Northern California Psychiatric Society.
- Medical school
- Board certified in active through 2025
Source: Dmand AI Professional Profile Data
Dr. Romeo Blas Mariano Jr. accepts plans from 2 insurance carriers
Dr. Mariano is in network with 2 carriers, including Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Massachusetts
- HCSC
Plan types Dr. Mariano accepts, by number of carriers
- Medicare2
- PPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Romeo Blas Mariano Jr.'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand 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 Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Romeo Blas Mariano Jr.
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. Romeo Blas Mariano Jr.'s NPI number?
Dr. Romeo Blas Mariano Jr.'s NPI number is 1639235831. It was assigned on December 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Romeo Blas Mariano Jr.?
Dr. Romeo Blas Mariano Jr. is a psychiatrist in Great Falls, Montana. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Romeo Blas Mariano Jr. practice?
Dr. Mariano practices at 3010 15th Avenue South, Great Falls, MT 59405. Dr. Mariano's primary practice is Great Falls Hospital in Great Falls, Montana, part of Surgery Partners.
What is Dr. Romeo Blas Mariano Jr.'s office phone number?
The practice phone on file for Dr. Mariano is (406) 216-8000.
What is Dr. Romeo Blas Mariano Jr.'s medical license number?
Dr. Mariano holds California license G73692.
Which hospitals is Dr. Romeo Blas Mariano Jr. affiliated with?
Dr. Mariano practices at Great Falls Hospital in Great Falls, Montana.
Does Dr. Romeo Blas Mariano Jr. accept Medicare?
Yes. CMS data shows Dr. Mariano billed Medicare for 113 services in 2021.
Is Dr. Romeo Blas Mariano Jr. board certified?
Yes. Dr. Mariano is board certified in active through 2025 by the Psychiatry, CA.
What services does Dr. Romeo Blas Mariano Jr. bill to Medicare?
In 2021, Dr. Mariano's most billed Medicare services were care management and other visits (99443), office visit, established patient (99215) and care management and other visits (99442).
Where did Dr. Romeo Blas Mariano Jr. go to medical school?
Dr. Mariano graduated from UC San Diego School of Medicine in 1990.
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What drugs does Dr. Romeo Blas Mariano Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Mariano's most prescribed drugs by claims were Clonazepam, Levothyroxine Sodium and Liothyronine Sodium.
Has Dr. Romeo Blas Mariano Jr. received payments from drug or device companies?
CMS Open Payments shows $471 in general payments to Dr. Mariano from 7 companies from 2016 to 2020. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Romeo Blas Mariano Jr. been practicing?
Dr. Mariano graduated from medical school in 1990, 36 years ago.
Does Dr. Romeo Blas Mariano Jr. do research?
Dmand AI links 1 publication to Dr. Mariano.
Who does Dr. Romeo Blas Mariano Jr. publish with?
Dr. Mariano's most frequent co-authors are William James Lewis, MD (1 shared paper).
What insurance does Dr. Romeo Blas Mariano Jr. accept?
Dr. Mariano is in network with 2 carriers, including Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
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