Int J Comput Assist Radiol Surg
Dr. Masaru Ishii, MD, PhD
NPI1427004381PAC ID3779616628
- Medicare services, 2024
- 472
- Medicare patients, 2024
- 148
- Part D claims, 2024
- 406
- Publications
- 140
- MIPS score, 2024
- 83
- Practice address
- 10803 Falls Road, Suite 3100, Lutherville, MD 21093
- Practice phone
- Call (410) 616-7650
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Johns Hopkins Surgery Centers - Green Spring Station Pavilion III
Surgery Center - Medicare-Certified · Lutherville, Maryland
Find Dr. Ishii's professional email, personal email and mobile number
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Dr. Masaru Ishii is an otolaryngologist in Lutherville Timonium, Maryland
Dr. Ishii practices at Johns Hopkins Surgery Centers - Green Spring Station Pavilion III in Lutherville, Maryland.
Dr. Ishii's NPI, 1427004381, was assigned on May 25, 2006. Dr. Ishii graduated from Perelman School of Med at the University of Pennsylvania in 1997. Dr. Ishii holds Maryland license D59315.
NPI and contact details
- NPI
- 1427004381NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3779616628
- NPI enumeration date
- May 25, 2006
- NPI status
- Active
- Practice phone
- (410) 616-7650
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Masaru Ishii practices at Johns Hopkins Surgery Centers - Green Spring Station Pavilion III in Lutherville, Maryland
Dr. Ishii's primary practice is Johns Hopkins Surgery Centers - Green Spring Station Pavilion III, at 10803 Falls Road, Suite 3100, Lutherville, MD 21093. The practice phone is (410) 616-7650.
- Johns Hopkins Surgery Centers - Green Spring Station Pavilion III10803 Falls Road, Suite 3100, Lutherville, MD 21093Phone(410) 616-7650
Source: Dmand AI Affiliation Data
Dr. Masaru Ishii is affiliated with 3 sites of care and 2 medical groups
Dr. Ishii's primary practice is Johns Hopkins Surgery Centers - Green Spring Station Pavilion III in Lutherville, Maryland. Dr. Ishii is also affiliated with The Johns Hopkins Hospital. The medical group on file is Johns Hopkins Medicine. Dmand AI also links Dr. Ishii to 1 more hospital and 1 medical group, each named with a free account.
Johns Hopkins Surgery Centers - Green Spring Station Pavilion IIIPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Masaru Ishii's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ishii practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Johns Hopkins Surgery Centers - Green Spring Station Pavilion III | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Masaru Ishii is one of 213 otolaryngologists in Maryland
Otolaryngology is Dr. Ishii's primary specialty in the NPI Registry, under taxonomy code 207Y00000X. Dr. Ishii is licensed in Maryland.
Specialties and state licenses
- Otolaryngology, MarylandPrimary
Otolaryngologists near Dr. Ishii
Counts of otolaryngologists 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. Masaru Ishii billed Medicare for 472 services in 2024
CMS data shows 472 Medicare services from Dr. Ishii across 5 procedure codes in 2024, for 148 Medicare patients. Medicare paid $42,880 for them.
Medicare services, 2024472
Medicare patients148
Paid by Medicare$42,880
Procedure codes5
Dr. Ishii's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 3122024: 25120%
- Office and hospital visits
- 2023: 1802024: 22123%
Where Dr. Ishii's Medicare services took place, 2024
- In an office36477%
- In a facility10823%
Dr. Ishii compared with the Maryland median for otolaryngologists, 2024
- Dr. Ishii
- Maryland median
- Medicare services
- 472vs 80241% below
- Medicare patients
- 148vs 40664% below
- Part D claims
- 367vs 1762.1 times
Medians across 207 otolaryngologists in Maryland with Dmand AI profiles that report each measure.
Dr. Ishii'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. Ishii and other otolaryngologists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Masaru Ishii treated 148 Medicare patients in 2024, average age 70
CMS counts 148 Medicare patients who saw Dr. Ishii in 2024. The largest group is 65 to 74, with 81 patients. 74% of them have high blood pressure, and 74% have high cholesterol. 13% are also on Medicaid. Their average risk score is 1.18, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ishii's median patient age at 68, with 61% women.
Medicare patients, 2024148
Average age70
Average risk score1.18
Also on Medicaid13%
Dr. Ishii's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Ishii's Medicare patients by sex, 2024
- Women7551%
- Men7349%
Chronic conditions among Dr. Ishii's Medicare patients, 2024
- High blood pressure74%
- High cholesterol74%
- Arthritis51%
- Anxiety30%
- Diabetes29%
- Mood disorders28%
- Depression25%
- Ischemic heart disease23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ishii's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women61%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Masaru Ishii wrote 406 Medicare Part D claims in 2024
In 2024, Dr. Ishii wrote 406 Medicare Part D claims for 105 patients. 100% of them were for generic drugs. CMS names the drug for 367 of them, across 9 drugs with 11 or more claims each, at $10,832 in total drug cost. In 2023, CMS named 471 claims across 9 drugs.
Part D claims, 2024406
Drugs named by CMS9
Total drug cost$10,832
Part D patients105
Dr. Ishii's Part D claims by kind of drug, 2024
- Generic405 claims100%
- Brand-name and other1 claims0%
Dr. Ishii'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. Ishii's Part D claims, 2024
- Antibiotics13%51 of 406 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: 4712024: 36722%
Drugs named by CMS: 9 in 2024, 9 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
Dr. Masaru Ishii scored 83 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 83 out of 100 for Dr. Ishii for performance year 2024, reported as part of a group.
Dr. Ishii's MIPS scores, performance year 2024
- 83of 100Final score
- 73.9of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 70of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Masaru Ishii has 140 publications on record
Dmand AI links 140 papers to Dr. Ishii, published from 2010 to 2025. 2019 was the busiest year, with 10. The most frequent topics are Magnetic Resonance Imaging, Endoscopy and Plastic Surgery Procedures. Dr. Ishii has published most often in JAMA Facial Plast Surg. Dr. Ishii's most frequent co-authors are Lisa Earnest Ishii, MD, Gary Louis Gallia, MD, PhD and Patrick Jospeh Byrne, MD.
Papers140
Years published2010 to 2025
Dr. Ishii's papers by year, 2016 to 2025
Topics Dr. Ishii writes about most
- Magnetic Resonance Imaging
- Endoscopy
- Plastic Surgery Procedures
- Tomography, X-Ray Computed
- Facial Paralysis
- Social Perception
- Algorithms
- Helium
Dr. Ishii's most frequent co-authors
- Lisa Earnest Ishii, MD59 shared papers
- Gary Louis Gallia, MD, PhD40 shared papers
- Patrick Jospeh Byrne, MD26 shared papers
Recent publications by Dr. Ishii
Facial Plast Surg Aesthet Med
BeautyEstheticsLip
Constriction, PathologicCranial SinusesEncephalocele
Otolaryngol Head Neck Surg
Deep LearningMaxillary SinusNasal Septum
Int J Comput Assist Radiol Surg
AlgorithmsEndoscopyImage Processing, Computer-Assisted
See who Dr. Ishii researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ishii works with, so you can find a warm path to the right otolaryngologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Masaru Ishii received $1,809 in industry payments from 2017 to 2025
CMS Open Payments shows 8 general payments to Dr. Ishii from 4 drug and device companies from 2017 to 2025. Speaker and faculty fees make up the largest share, 83% of the total. KARL STORZ Endoscopy-America paid the most, $1,500.
General payments to Dr. Ishii by program year, 2017 to 2025
General payments to Dr. Ishii by kind, 2017 to 2025
$1.8Kin total
- Speaker and faculty fees$1,50083%
- Food and beverage$30917%
Companies that paid Dr. Ishii the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Masaru Ishii graduated from Perelman School of Med at the University of Pennsylvania
Dr. Ishii graduated from Perelman School of Med at the University of Pennsylvania in 1997.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Masaru Ishii'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (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 |
| 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. Masaru Ishii
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. Masaru Ishii's NPI number?
Dr. Masaru Ishii's NPI number is 1427004381. It was assigned on May 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Masaru Ishii?
Dr. Masaru Ishii is an otolaryngologist in Lutherville Timonium, Maryland. The primary specialty in the NPI Registry is Otolaryngology Physician (taxonomy code 207Y00000X).
Where does Dr. Masaru Ishii practice?
Dr. Ishii practices at 10803 Falls Road, Suite 3100, Lutherville, MD 21093. Dr. Ishii's primary practice is Johns Hopkins Surgery Centers - Green Spring Station Pavilion III in Lutherville, Maryland. Dmand AI also links Dr. Ishii to 1 hospital and 1 medical group.
What is Dr. Masaru Ishii's office phone number?
The practice phone on file for Dr. Ishii is (410) 616-7650.
What is Dr. Masaru Ishii's medical license number?
Dr. Ishii holds Maryland license D59315.
Which hospitals is Dr. Masaru Ishii affiliated with?
Dr. Ishii is affiliated with The Johns Hopkins Hospital. Dmand AI links Dr. Ishii to 1 more hospital.
What medical group is Dr. Masaru Ishii part of?
Dr. Ishii is linked to Johns Hopkins Medicine. Dmand AI links Dr. Ishii to 1 more medical group.
Does Dr. Masaru Ishii accept Medicare?
Yes. CMS data shows Dr. Ishii billed Medicare for 472 services in 2024.
What is Dr. Masaru Ishii's MIPS score?
Dr. Ishii's MIPS final score for performance year 2024 is 83 out of 100, reported as part of a group.
How many Medicare patients does Dr. Masaru Ishii see?
CMS counts 148 Medicare patients who saw Dr. Ishii in 2024, with an average age of 70.
Show 7 more questionsShow fewer questions
What services does Dr. Masaru Ishii bill to Medicare?
In 2024, Dr. Ishii's most billed Medicare services were surgery: lungs and airway (31231), office visit, established patient (99213) and office visit, established patient (99212).
Where did Dr. Masaru Ishii go to medical school?
Dr. Ishii graduated from Perelman School of Med at the University of Pennsylvania in 1997.
What drugs does Dr. Masaru Ishii prescribe most?
In 2024 Medicare Part D data, Dr. Ishii's most prescribed drugs by claims were Fluticasone Propionate, Azelastine HCl and Ipratropium Bromide.
Has Dr. Masaru Ishii received payments from drug or device companies?
CMS Open Payments shows $1,809 in general payments to Dr. Ishii from 4 companies from 2017 to 2025. The largest total came from KARL STORZ Endoscopy-America.
How long has Dr. Masaru Ishii been practicing?
Dr. Ishii graduated from medical school in 1997, 29 years ago.
Does Dr. Masaru Ishii do research?
Dmand AI links 140 publications to Dr. Ishii, published from 2010 to 2025.
Who does Dr. Masaru Ishii publish with?
Dr. Ishii's most frequent co-authors are Lisa Earnest Ishii, MD (59 shared papers), Gary Louis Gallia, MD, PhD (40 shared papers) and Patrick Jospeh Byrne, MD (26 shared papers).
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