Physician Profile
Gregory S. Larsen, D.O.
Unclaimed ProfileAbout Dr. Larsen
Gregory S. Larsen, D.O. practices emergency medicine in Colton, CA. Medicare claims data shows Gregory provided 906 services to 818 patients. The services billed most often include emergency department visit with moderate level of medical decision making, emergency department visit with high level of medical decision making, and routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only.
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
- (909) 580-1000
- Email not available
Practice Locations
400 N PEPPER AVE
Colton, CA 92324
Conditions Commonly Evaluated or Treated
Within Emergency 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
Abdomen & Digestion
- Appendicitis
- Lower gastrointestinal bleeding
- Vomiting or throwing up blood
Allergy & Immune
- Angioedema
Allergy & Immunology
- Severe Allergic Reaction
Bites & Stings
- Snake Bite or Venomous Sting
- Spider or insect sting reaction
Blood & Circulation
- Deep vein thrombosis
Brain & Nerves
- Delirium
- Fainting and syncope
- Seizure in Child
- Severe headache or sudden migraine
- Status epilepticus
- Stroke
- Transient ischemic attack
Breathing
- Choking or swallowed object
- Coughing up blood
- Severe asthma attack
- Shortness of breath
Digestion & Stomach
- Abdominal Pain
- Acute gallbladder inflammation
- Bowel obstruction
Ear, Nose & Throat
- Nosebleeds
Endocrine & Metabolic
- Dangerous high blood sugar
- Dangerously low blood sugar
Environmental
- Heat stroke
- Hypothermia and frostbite
Eye Care
- Open-globe eye injury
Eye Emergency
- Corneal abrasion
General Emergency
- Severe dehydration
- Uncontrolled bleeding
Heart & Chest
- Acute coronary syndrome
- Heart palpitations
Heart & Circulation
- Dangerous high blood pressure
Heart & Lungs
- Blood Clot in Lung
Infections & Illness
- High fever
- Sepsis or blood infection
Injuries & Trauma
- Animal or dog bite
- Bone fractures
- Deep cut or wound
- Dislocated joint
- Severe burn
- Sprains and muscle strains
- Traumatic brain injury
Lungs & Breathing
- Collapsed lung
Men's Health
- Testicular torsion
Poisoning & Environmental
- Smoke Inhalation
Poisoning & Toxins
- Drug overdose or poisoning
Skin & Infections
- Skin abscess or boil
Spine & Back
- Severe back pain
Urinary & Bladder
- Inability to pee
Urinary & Kidney
- Kidney stones
Women's Health
- Ectopic pregnancy
- Heavy vaginal bleeding
Procedures & services
Abdominal Procedures
- Paracentesis
Airway & Breathing
- Emergency surgical airway
Anesthesia & Sedation
- Moderate dental sedation
Breathing & Airway
- Breathing Treatment
- Emergency intubation
Critical Care
- Blood transfusion
- Central line placement
- Chest tube insertion
- CPR and defibrillation
Diagnostics
- Lumbar puncture
- Rapid blood work
Digestive Care
- Urgent upper endoscopy
Ear, Nose & Throat
- Nasal packing for nosebleed
Eye & ENT
- Eye-pressure measurement
- Foreign Object Removal from Eye
- Superficial foreign-body removal
Eye Care
- Emergency Eye Flushing
Heart & Diagnostics
- Cardioversion for rapid heartbeat
- EKG
Heart Care
- Temporary Pacemaker Placement
Imaging & Diagnostics
- Emergency CT scan
- Emergency MRI scan
- Emergency ultrasound
- Emergency X-ray
Injections & Vaccines
- Rabies shot series
- Tetanus shot
Kidney Care
- Emergency dialysis
Lung & Respiratory
- Chest Needle Decompression
- Draining lung fluid
Medications
- Emergency epinephrine injection
- IV medication for severe nausea
- IV medication for severe pain
Mental Health
- Emergency psychiatric evaluation
Minor Procedures
- Fishhook or embedded splinter removal
- Incision and drainage of an abscess
- Nasal cautery for nosebleeds
- Tick Removal
- Urinary catheter insertion
Minor Trauma
- Stuck ring removal
Orthopedic Procedures
- Joint injection or aspiration
Orthopedics
- Popping a dislocated joint back in place
- Splinting and temporary casting
Poisoning & Toxicology
- Antivenom treatment
Specialized Care
- Sexual assault forensic exam
Stroke & Vascular
- Clot busting medication for stroke
Supportive Care
- IV fluids
Toxicology
- Narcan overdose reversal
- Stomach pumping or activated charcoal
Women's Health
- Emergency pelvic exam
Wound Care
- Burn dressing and care
- Skin glue for cuts
- Stitches and Laceration Repair
- Wound cleaning and debridement
- Wound stapling
Procedures Most Often Billed to Medicare
906 services · 818 patients · 6 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Simple repair of surface wound of scalp, neck, underarms, trunk, arms, or legs, 2.6-7.5 cm | Procedure | 12002 |
11 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | Treatment | 93010 |
109 |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
383 |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
323 |
| Emergency department visit with low level of medical decision making | Office visit | 99283 |
56 |
| Critical care, first 30-74 minutes | Office visit | 99291 |
24 |
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.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
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 emergency physicians in Colton 8
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 2007 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Simple repair of surface wound of scalp, neck, underarms, trunk, arms, or legs, 2.6-7.5 cm 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Gregory S. Larsen?
Gregory S. Larsen is an emergency physician in Colton, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Emergency Medicine”.
NPI registry
What is Gregory S. Larsen's address?
Gregory S. Larsen is listed at 400 N Pepper Ave, Colton, CA 92324. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Gregory S. Larsen?
The number on file is (909) 580-1000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Gregory S. Larsen?
Gregory S. Larsen's National Provider Identifier is 1104073709. 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
Where did Gregory S. Larsen train?
Gregory S. Larsen attended Other, graduating in 2007. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Gregory S. Larsen have?
Gregory S. Larsen has 19 years experience. Calculated from a graduation year of 2007, reported in the CMS National Downloadable File.
CMS public data
What procedures does Gregory S. Larsen perform?
According to Medicare billing data, Gregory S. Larsen performs procedures including simple repair of surface wound of scalp, neck, underarms, trunk, arms, or legs, 2.6-7.5 cm; provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report only, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Gregory S. Larsen's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Gregory S. Larsen. 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.