Physician Profile
Matthew R. Callahan, M.D.
Unclaimed ProfileAbout Dr. Callahan
Matthew R. Callahan, M.D. is a hospitalist practicing in San Diego, CA. Matthew is also listed as specializing in family medicine. Medicare claims data shows Matthew provided 424 services to 212 patients. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes, subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes, and hospital discharge day management, more than 30 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
Source: NPPES NPI Registry
Contact Information
- (619) 260-7125
- Email not available
Practice Locations
4077 FIFTH AVE MER 127
San Diego, CA 92103
Conditions Commonly Evaluated or Treated
Within Hospital Medicine 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
Allergic Reactions
Blood Clots
Blood Disorders
Brain & nerves
Brain & Nerves
Breathing & lungs
Digestive health
- Acute gallbladder inflammation
- Acute pancreatitis
- Ascites
- Bowel obstruction
- C. diff diarrhea
- Severe diverticulitis flare-up
- Stomach or intestinal bleeding
Emergencies
Endocrine
General medical
- Hip fracture medical care
- Low sodium or electrolyte imbalance
- Post-surgery fever or infection
- Severe dehydration
- Short stature and growth concerns
Heart & Circulation
Heart & circulation
- Dangerous high blood pressure
- Deep vein thrombosis
- Heart failure flare-up
- Severe anemia
- Supraventricular tachycardia
- Unexplained chest pain
Hormones & diabetes
Infections
- Bone infection
- Cellulitis
- Complicated Bladder Infection
- Flesh-Eating Infection
- Infective endocarditis
- Sepsis or blood infection
- Severe COVID-19 illness
- Severe flu illness
Kidney & urinary
Liver & Digestive
Lung Infections
Lungs & Breathing
Nutrition
Procedures & services
Access & tubes
- Arterial catheter placement
- Central line placement
- Feeding or stomach tube insertion
- PICC line placement coordination
- Urinary catheter insertion
Addiction Medicine
Airway & Breathing
Breathing support
Critical Care
Diagnostic procedures
- Emergency ultrasound
- Hospital heart rhythm monitoring
- Lumbar puncture
- Swallowing safety evaluation coordination
Diagnostic Testing
Draining fluids
Emergency Care
Heart Procedures
Hospital services
- Alcohol detox monitoring
- Comfort care transition
- Fall risk assessment
- Hospital admission
- Hospital discharge planning
- Hospital observation care
- Hospital wound and bed sore care
- Inpatient dialysis coordination
- Inpatient physical therapy evaluation
- Medication management
- Post-surgery hospital recovery care
- Pre-surgery medical clearance
- Rehab or nursing home placement evaluation
- Specialist consultation coordination
Joint Procedures
Kidney Care
Lung Procedures
Medication & fluids
- Blood sugar insulin drip
- Blood thinner drip management
- Blood transfusion
- IV antibiotic treatment
- IV electrolyte replacement
- IV fluids
- Patient-Controlled Analgesia (PCA) Setup
Mental Health
Neurological Care
Nutrition Support
Rehabilitation
Urinary Care
Procedures Most Often Billed to Medicare
424 services · 212 patients · 4 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
227 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
112 |
| Hospital discharge day management, more than 30 minutes | Office visit | 99239 |
73 |
| Hospital discharge day management, 30 minutes or less | Office visit | 99238 |
12 |
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 hospitalists at this location 6
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 hospitalists in San Diego 7
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2011 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Matthew R. Callahan's specialty?
Matthew R. Callahan is a hospitalist in San Diego, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Matthew R. Callahan?
Matthew R. Callahan is listed at 4077 Fifth Ave Mer 127, San Diego, CA 92103. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Matthew R. Callahan?
The number on file is (619) 260-7125. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Matthew R. Callahan?
Matthew R. Callahan's National Provider Identifier is 1083901839. 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 Matthew R. Callahan's education?
Matthew R. Callahan attended Other, graduating in 2011. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Matthew R. Callahan have?
Matthew R. Callahan has 15 years experience. Calculated from a graduation year of 2011, reported in the CMS National Downloadable File.
CMS public data
What is Matthew R. Callahan known for?
According to Medicare billing data, Matthew R. Callahan the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Matthew R. Callahan's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Matthew R. Callahan. 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.