Physician Profile
Masaru Ishii, M.D., PhD
Unclaimed ProfileAbout Dr. Ishii
Masaru Ishii, M.D., PhD practices otolaryngology (ent) in Baltimore, MD. Masaru is a 1997 graduate of Perelman School of Med at the University of Pennsylvania. Medicare claims data shows Masaru provided 472 services to 321 patients. The services billed most often include diagnostic exam of nasal passages using an endoscope, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (410) 550-2368
- Email not available
Practice Locations
4940 EASTERN AVE
Baltimore, MD 21224
Conditions Commonly Evaluated or Treated
Within Otolaryngology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Balance
Ear and hearing
- Cholesteatoma
- Eustachian tube dysfunction
- Hearing loss
- Otosclerosis
- Perforated eardrum
- Swimmer's ear
Head, neck, and salivary
Nose and sinus
- Broken nose
- Deviated septum
- Loss or reduction of smell
- Nasal obstruction
- Nasal polyps
- Nosebleeds
- Seasonal allergies
Sleep and airway
Throat and voice
- Enlarged adenoids
- Globus sensation
- Hoarseness and voice change
- Laryngopharyngeal reflux
- Swallowing difficulties
- Vocal cord nodules
- Vocal cord paralysis
Cancer
Head & Neck
Throat & Voice
Procedures & services
Most searched procedures
Office diagnosis
Cosmetic
Ear & Hearing
Ear procedures
Head & Neck
Head and neck surgery
- Neck lymph-node dissection
- Parathyroid surgery
- Parotid gland surgery
- Thyroid removal surgery
- Voice-box removal
Nose & Sinus
Nose and sinus procedures
Sleep and airway
Throat & Voice
Throat, voice, and swallowing
Procedures Most Often Billed to Medicare
472 services · 321 patients · 8 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Diagnostic exam of nasal passages using an endoscope | Procedure | 31231 |
196 | More often than most peers in Otolaryngology (ENT) |
| Diagnostic exam of nasal passages using an endoscope | Procedure | 31231 |
55 | More often than most peers in Otolaryngology (ENT) |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
75 | As often as other peers in Otolaryngology (ENT) |
| Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | Office visit | 99212 |
68 | More often than most peers in Otolaryngology (ENT) |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
29 | As often as other peers in Otolaryngology (ENT) |
| Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | Office visit | 99212 |
24 | More often than most peers in Otolaryngology (ENT) |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
13 | Less often than most peers in Otolaryngology (ENT) |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
12 | Less often than most peers in Otolaryngology (ENT) |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other otolaryngology specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other otolaryngology specialists in Baltimore 7
Same specialty, same city.
More connections — 23 related providers in 3 groups
Trained at Perelman School of Med at the University of Pennsylvania 7
Other providers in the same specialty who trained at the same institution.
Class of 1997 at Perelman School of Med at the University of Pennsylvania 8
Providers who graduated from the same medical school in the same year.
Also performs Diagnostic exam of nasal passages using an endoscope 8
Providers in MD who bill this service to Medicare most often.
Common questions
What is Masaru Ishii, M.D.'s specialty?
Masaru Ishii, M.D. is an otolaryngology (ent) in Baltimore, MD. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Masaru Ishii, M.D.?
Masaru Ishii, M.D. is listed at 4940 Eastern Ave, Baltimore, MD 21224. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Masaru Ishii, M.D.?
The number on file is (410) 550-2368. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Masaru Ishii, M.D.?
Masaru Ishii, M.D.'s National Provider Identifier is 1427004381. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Masaru Ishii, M.D.'s education?
Masaru Ishii, M.D. attended Perelman School of Med at the University of Pennsylvania, graduating in 1997. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Masaru Ishii, M.D. have?
Masaru Ishii, M.D. has 29 years experience. Calculated from a graduation year of 1997, reported in the CMS National Downloadable File.
CMS public data
What is Masaru Ishii, M.D. known for?
According to Medicare billing data, Masaru Ishii, M.D. performs procedures including diagnostic exam of nasal passages using an endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Masaru Ishii, M.D.'s profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Masaru Ishii, M.D.. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.