TIMOTHY M SOWERBY MD
NPI 1063475952
Internal Medicine - Gastroenterology in Petaluma, CA

NPI Status: Active since April 11, 2006

Contact Information

3900 LAKEVILLE HWY
PETALUMA, CA
ZIP 94954
Phone: (707) 765-3900

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  • Individual
  • Male
  • Internal Medicine
  • Gastroenterology
  • PECOS Enrolled

About TIMOTHY SOWERBY

This page provides the complete NPI Profile along with additional information for Timothy Sowerby, an internist established in Petaluma, California with a medical specialization in Internal Medicine, focusing in gastroenterology . The healthcare provider is registered in the NPI registry with number 1063475952 assigned on April 2006. The practitioner's primary taxonomy code is 207RG0100X with license number A50116 (CA). The provider is registered as an individual and his NPI record was last updated January 2026.

NPI
1063475952
Provider Name
TIMOTHY M SOWERBY MD
Gender
Male
Entity Type
Individual
Location Address
3900 LAKEVILLE HWY PETALUMA, CA 94954
Location Phone
(707) 765-3900
Mailing Address
3900 LAKEVILLE HWY PETALUMA, CA 94954
Mailing Phone
(707) 765-3900
Is Sole Proprietor?
No
Enumeration Date
04-11-2006
Last Update Date
01-15-2026
Code Navigator

An internist like Timothy Sowerby is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine Gastroenterology

Taxonomy Code
207RG0100X
Type
Allopathic & Osteopathic Physicians
License No.
A50116
License State
CA
Taxonomy Description
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207RG0100XAllopathic & Osteopathic Physicians

Internal Medicine
Gastroenterology

A050116 (CA)

Medicare Participation & PECOS Enrollment Status

Timothy Sowerby is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

This service was performed 94 times for 94 patients

Biopsy of large bowel using a flexible endoscope

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

This service was performed 50 times for 50 patients

Colorectal cancer screening; colonoscopy on individual at high risk

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

This service was performed 50 times for 50 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

This service was performed 53 times for 53 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

This service was performed 21 times for 21 patients

Diagnostic exam of large bowel using a flexible endoscope

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

This service was performed 25 times for 25 patients

Established patient office or other outpatient visit, 20-29 minutes

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

This service was performed 74 times for 63 patients

Established patient office or other outpatient visit, 30-39 minutes

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

This service was performed 178 times for 143 patients

Follow-up hospital inpatient care per day, typically 25 minutes

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

This service was performed 34 times for 27 patients

Initial hospital inpatient care per day, typically 70 minutes

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

This service was performed 56 times for 55 patients

Insertion of guide wire with dilation of esophagus using a flexible endoscope

This is a procedure where a thin tube, called an endoscope, is gently passed through your mouth into your esophagus. A guide wire is then inserted to help widen any narrow areas. This helps improve swallowing and reduce discomfort.

This service was performed 20 times for 20 patients

New patient office or other outpatient visit, 30-44 minutes

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

This service was performed 55 times for 55 patients

New patient office or other outpatient visit, 45-59 minutes

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

This service was performed 140 times for 140 patients

Online digital evaluation and management service for an established patient for up to 7 days, total time 11-20 minutes

This is a digital health service for existing patients. Over a week, your healthcare provider will assess and manage your health concerns online. The total time spent communicating will be between 11-20 minutes. This service offers convenience and continuous care.

This service was performed 32 times for 30 patients

Removal of external hemorrhoids by rubber banding

Rubber band ligation is a procedure used to treat external hemorrhoids. A doctor places small rubber bands around the base of the hemorrhoids. This cuts off blood supply, causing them to shrink and fall off, typically within a week.

This service was performed 22 times for 11 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

This service was performed 148 times for 147 patients

Telephone medical discussion with physician, 11-20 minutes

This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.

This service was performed 24 times for 19 patients

Telephone medical discussion with physician, 21-30 minutes

This service involves a 21-30 minute phone conversation with a physician. It's a chance for you to discuss your health concerns, symptoms or treatment plans. It's similar to an in-person consultation, but conducted over the phone for your convenience and safety.

This service was performed 31 times for 28 patients

Physician Visit Costs

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 94954 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $142
  • Minimum New Patient Price $63.04
  • Maximum New Patient Price $187.01
  • Average New Patient Copayment $35.5
  • Minimum New Patient Copayment $15.76
  • Maximum New Patient Copayment $46.75

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $109.88
  • Minimum Established Patient Price $21.02
  • Maximum Established Patient Price $153.4
  • Average Established Patient Copayment $27.47
  • Minimum Established Patient Copayment $5.25
  • Maximum Established Patient Copayment $38.35

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1063475952, we treat the final digit (2) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 58. The final step is to find the difference between that total and the next multiple of ten (60 - 58 = 2).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
0
Unchanged
Pos 3
6
Doubled → 12 → 1 + 2
Pos 4
3
Unchanged
Pos 5
4
Doubled → 8
Pos 6
7
Unchanged
Pos 7
5
Doubled → 10 → 1 + 0
Pos 8
9
Unchanged
Pos 9
5
Doubled → 10 → 1 + 0
Check
2
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 6 → 12 → 3 4 → 8 5 → 10 → 1 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 0 + 1 + 2 + 3 + 8 + 7 + 1 + 0 + 9 + 1 + 0 + 24 = 58

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 58 is 60. The difference is the calculated check digit.

60 - 58 = 2
This NPI is valid
The calculated check digit is 2, which matches the last digit of 1063475952.

Other Providers at the Same Location


The following 20 providers are registered at the same or a nearby location.

Family Medicine
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Midwife
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Emergency Medicine
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Internal Medicine
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Preventive Medicine (Occupational Medicine)
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Pediatrics
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Physical Medicine & Rehabilitation
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Pediatrics
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Obstetrics & Gynecology
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Pediatrics
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Psychiatry & Neurology (Psychiatry)
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Preventive Medicine (Occupational Medicine)
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Psychologist (Clinical)
3900 LAKEVILLE HWY, KAISER - DEPARTMENT OF PSYCHIATRY
PETALUMA, CA 94954
Audiologist
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Physical Therapist
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Psychologist
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Dietitian, Registered
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Marriage & Family Therapist
3900 LAKEVILLE HWY, KAISER PSYCHIATRY, MOB II
PETALUMA, CA 94954
Social Worker (Clinical)
3900 LAKEVILLE HWY
PETALUMA, CA 94954
Optometrist
3900 LAKEVILLE HWY
PETALUMA, CA 94954

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1063475952, enumerated as an "individual" on April 11, 2006.

The provider is located at 3900 LAKEVILLE HWY PETALUMA, CA 94954 and the phone number is (707) 765-3900.

Internal Medicine with taxonomy code 207RG0100X and a focus in Gastroenterology.