Dr. Steven P. Yamaguchi, MD
- Medicare services, 2024
- 396
- Medicare patients, 2024
- 352
- Part D claims, 2024
- 418
- Hospital affiliations
- 2
- Industry payments
- $14
- Practice address
- 730 West Market Street, Lima, OH 45801
- Practice phone
- Call (419) 227-3361
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Yamaguchi's professional email, personal email and mobile number
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Dr. Steven P. Yamaguchi is an emergency medicine physician in Lima, Ohio
Dr. Yamaguchi practices at Mercy Health - St. Rita's Medical Center in Lima, Ohio, part of Bon Secours Mercy Health.
Dr. Yamaguchi's NPI, 1912958349, was assigned on May 12, 2006. Dr. Yamaguchi graduated from University of Cincinnati College of Medicine in 1995. Dr. Yamaguchi holds Ohio license 35071257Y.
- NPI
- 1912958349NPI Registry (opens in a new tab)
- NPI enumeration date
- May 12, 2006
- NPI status
- Active
- Practice phone
- (419) 227-3361
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Steven P. Yamaguchi practices at Mercy Health - St. Rita's Medical Center in Lima, Ohio
Dr. Yamaguchi's primary practice is Mercy Health - St. Rita's Medical Center, at 730 West Market Street, Lima, OH 45801 in Allen County. The practice phone is (419) 227-3361.
- Mercy Health - St. Rita's Medical Center730 West Market Street, Lima, OH 45801 · Allen CountyPhone(419) 227-3361
Source: Dmand AI Affiliation Data
Dr. Steven P. Yamaguchi is affiliated with 2 sites of care and 2 medical groups
Dr. Yamaguchi's primary practice is Mercy Health - St. Rita's Medical Center in Lima, Ohio, part of Bon Secours Mercy Health. Dr. Yamaguchi is also affiliated with Mercy Health - Fairfield Hospital. The medical group on file is Emergency Professional Services of Ohio, Inc. Dmand AI also links Dr. Yamaguchi to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Steven P. Yamaguchi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Yamaguchi practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercy Health - St. Rita's Medical Center | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Steven P. Yamaguchi is one of 2,401 emergency medicine physicians in Ohio
Emergency medicine is Dr. Yamaguchi's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Yamaguchi is licensed in Ohio.
Specialties and state licenses
- Emergency medicine, OhioPrimary
Emergency medicine physicians near Dr. Yamaguchi
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. Steven P. Yamaguchi billed Medicare for 396 services in 2024
CMS data shows 396 Medicare services from Dr. Yamaguchi across 3 procedure codes in 2024, for 352 Medicare patients. Medicare paid $37,271 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Yamaguchi's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3922024: 3961%
Dr. Yamaguchi compared with the Ohio median for emergency medicine physicians, 2024
- Dr. Yamaguchi
- Ohio median
- Medicare services
- 396vs 26649% above
- Medicare patients
- 352vs 24842% above
- Part D claims
- 284vs 654.4 times
Medians across 2,448 emergency medicine physicians in Ohio with Dmand AI profiles that report each measure.
Dr. Yamaguchi'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Steven P. Yamaguchi treated 352 Medicare patients in 2024, average age 76
CMS counts 352 Medicare patients who saw Dr. Yamaguchi in 2024. The largest group is 75 to 84, with 129 patients. 75% of them have high blood pressure, and 72% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.43, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Yamaguchi's median patient age at 40, with 53% women.
Dr. Yamaguchi's Medicare patients by age, 2024
Dr. Yamaguchi's Medicare patients by sex, 2024
- Women20157%
- Men15143%
Chronic conditions among Dr. Yamaguchi's Medicare patients, 2024
- High blood pressure75%
- High cholesterol72%
- Arthritis59%
- Ischemic heart disease39%
- Anxiety34%
- Mood disorders34%
- Depression32%
- Diabetes31%
Share of Medicare patients with each condition. A patient can have several.
Dr. Yamaguchi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 40
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Steven P. Yamaguchi wrote 418 Medicare Part D claims in 2024
In 2024, Dr. Yamaguchi wrote 418 Medicare Part D claims for 262 patients. 97% of them were for generic drugs. CMS names the drug for 284 of them, across 11 drugs with 11 or more claims each, at $1,502 in total drug cost. In 2023, CMS named 265 claims across 12 drugs.
Dr. Yamaguchi's Part D claims by kind of drug, 2024
- Generic406 claims97%
- Brand-name and other12 claims3%
Dr. Yamaguchi'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. Yamaguchi's Part D claims, 2024
- Opioids14%59 of 418 claims
- Antibiotics46%191 of 418 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: 2652024: 2847%
Drugs named by CMS: 11 in 2024, 12 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. Steven P. Yamaguchi received $14 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Yamaguchi from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $14.
Companies that paid Dr. Yamaguchi the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Steven P. Yamaguchi graduated from University of Cincinnati College of Medicine
Dr. Yamaguchi graduated from University of Cincinnati College of Medicine in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Steven P. Yamaguchi'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 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) |
| 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. Steven P. Yamaguchi
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. Steven P. Yamaguchi's NPI number?
Dr. Steven P. Yamaguchi's NPI number is 1912958349. It was assigned on May 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Steven P. Yamaguchi?
Dr. Steven P. Yamaguchi is an emergency medicine physician in Lima, Ohio. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Steven P. Yamaguchi practice?
Dr. Yamaguchi practices at 730 West Market Street, Lima, OH 45801. Dr. Yamaguchi's primary practice is Mercy Health - St. Rita's Medical Center in Lima, Ohio, part of Bon Secours Mercy Health. Dmand AI also links Dr. Yamaguchi to 1 medical group.
What is Dr. Steven P. Yamaguchi's office phone number?
The practice phone on file for Dr. Yamaguchi is (419) 227-3361.
What is Dr. Steven P. Yamaguchi's medical license number?
Dr. Yamaguchi holds Ohio license 35071257Y.
Which hospitals is Dr. Steven P. Yamaguchi affiliated with?
Dr. Yamaguchi practices at Mercy Health - St. Rita's Medical Center in Lima, Ohio. Dr. Yamaguchi is also affiliated with Mercy Health - Fairfield Hospital.
What medical group is Dr. Steven P. Yamaguchi part of?
Dr. Yamaguchi is linked to Emergency Professional Services of Ohio, Inc. Dmand AI links Dr. Yamaguchi to 1 more medical group.
Does Dr. Steven P. Yamaguchi accept Medicare?
Yes. CMS data shows Dr. Yamaguchi billed Medicare for 396 services in 2024.
How many Medicare patients does Dr. Steven P. Yamaguchi see?
CMS counts 352 Medicare patients who saw Dr. Yamaguchi in 2024, with an average age of 76.
What services does Dr. Steven P. Yamaguchi bill to Medicare?
In 2024, Dr. Yamaguchi's most billed Medicare services were emergency department visit (99284), emergency department visit (99285) and emergency department visit (99283).
Show 4 more questionsShow fewer questions
Where did Dr. Steven P. Yamaguchi go to medical school?
Dr. Yamaguchi graduated from University of Cincinnati College of Medicine in 1995.
What drugs does Dr. Steven P. Yamaguchi prescribe most?
In 2024 Medicare Part D data, Dr. Yamaguchi's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Ondansetron ODT and Ciprofloxacin HCl.
Has Dr. Steven P. Yamaguchi received payments from drug or device companies?
CMS Open Payments shows $14 in general payments to Dr. Yamaguchi from 1 company from 2016 to 2016. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Steven P. Yamaguchi been practicing?
Dr. Yamaguchi graduated from medical school in 1995, 31 years ago.
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