1. Home
  2. Directory
  3. California
  4. Sonora
  5. Internal Medicine
  6. NPI Profile

DR. JAMES D. MOSSON M.D.
NPI 1437135670
Internal Medicine in Sonora, CA

Active since December 20, 2005PECOS EnrolledAccepts Medicare Assignment
900 GREENLEY RD, SUITE 922, SONORA, CA 95370(209) 536-3738(209) 536-3565 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. James D. Mosson M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JAMES D. MOSSON M.D. (NPI 1437135670) is an individual internal medicine provider in Sonora, California, licensed in California (G25381) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS and is a graduate of University Of California, Davis School Of Medicine (1972).

NPPES Registry Identity

NPI1437135670
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. JAMES D. MOSSONCredential: M.D.
Location Address900 GREENLEY RD, SUITE 922Sonora, CA 95370-5287
Mailing Address900 Greenley Rd, Suite 922Sonora, CA 95370-5287 · (209) 536-3738 · Fax (209) 536-3565
Phone(209) 536-3738
Fax(209) 536-3565
Sole ProprietorNo
Medical School CMSUniversity Of California, Davis School Of MedicineGraduated 1972
Enumeration DateDecember 20, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1437135670 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · G25381
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
900 GREENLEY RD, Sonora, CA 95370
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. James D. Mosson M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5496764276
PECOS Enrollment IDI20060406000592
Eligible to Order & Refer– Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show James Mosson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Mark Twain Health Care District
29 mi
Rural Health
51 WELLNESS WAY
Valley Springs, CA 95252
  • Reassigned Medicare billing, California enrollment
  • 16 clinicians in this Medicare group
NPI 1306311329 (209) 772-7070

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

X-ray of chest, 2 views 71046
A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.
26 services23 patients
Hemoglobin a1c level 83036
Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.
24 services21 patients
Detection test by immunoassay with direct visual observation for influenza virus 87804
This is a test that identifies the influenza virus in your body. It works by using an immunoassay, a method that detects the presence of the virus through an immune response. The results are directly observable, making it a quick and efficient way to diagnose flu.
15 services15 patients
Detection test by immunoassay with direct visual observation for respiratory syncytial virus 87807
This is a test to identify the respiratory syncytial virus, a common cause of lung and respiratory tract infections. It uses immunoassay, a method that detects the virus through a reaction between the virus and specific antibodies. The result is visually observed.
14 services14 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95370 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$133.94 typical visit price
range $58.87 – $176.60
Typical copayment $33.48 (range $14.71 – $44.15)
Most-billed visit code 99204
Established Patient
$103.36 typical visit price
range $19.28 – $144.60
Typical copayment $25.84 (range $4.82 – $36.15)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Breast Cancer Screening
50%139 patients3/55-star benchmark: 93%
Cervical Cancer Screening
49%103 patients3/55-star benchmark: 98%
Closing the Referral Loop: Receipt of Specialist Report
38%238 patients2/55-star benchmark: 87%
Controlling High Blood Pressure
35%285 patients2/55-star benchmark: 91%
Diabetes: Eye Exam
6%77 patients1/55-star benchmark: 100%
Diabetes: Hemoglobin A1c (HbA1c) Poor Control (>9%)
Lower rates are better for this measure.
43%77 patients3/55-star benchmark: 91%
Documentation of Current Medications in the Medical Record
57%1,997 patients2/55-star benchmark: 100%
Falls: Screening for Future Fall Risk
0%350 patients1/55-star benchmark: 100%
Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan
17%565 patients1/55-star benchmark: 98%
Preventive Care and Screening: Screening for Depression and Follow-Up Plan
0%459 patients1/55-star benchmark: 97%
Preventive Care and Screening: Tobacco Use: Screening and Cessation Intervention
Patients combinedPopulations: 29% · 526 patients
Patients screened: 33% · 526 patients
37%27 patients2/55-star benchmark: 100%
Statin Therapy for the Prevention and Treatment of Cardiovascular Disease
80%158 patients4/55-star benchmark: 91%
Use of High-Risk Medications in Older Adults
Lower rates are better for this measure.
Patients appropriateDiagnosis: 6% · 329 patients
Patients totalRate: 13% · 364 patients
12%364 patients3/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 4

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
7 suppliers40 claims73 services$5.64 avg. paid by Medicare
Residual limb support system for wheelchair, any type E1020
DME-Wheelchairs · category DD021N
1 supplier11 claims11 services$14.85 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
5 suppliers39 claims39 services$189.68 avg. paid by Medicare
Power wheelchair, group 2 standard, captains chair, patient weight capacity up to and including 300 pounds K0823
DME-Wheelchairs · category DD009N
1 supplier11 claims11 services$212.78 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 16

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SONORA COMMUNITY HOSPITAL
Internal Medicine (Cardiovascular Disease)
900 GREENLEY RD, SUITE 911
SONORA, CA 95370
Tuolumne County (209) 532-0511
MR. EDMAN FUENTES PAC
Physician Assistant (Surgical)
900 GREENLEY RD, SUITE 914
SONORA, CA 95370
Tuolumne County (925) 469-6274
DR. KEVIN A. ORCA PHARM.D.
Pharmacist
900 GREENLEY RD, STE 912
SONORA, CA 95370
Tuolumne County (209) 536-3700
JAMES LEONARD COMAZZI M.D.
Specialist
900 GREENLEY RD, SUITE 911
SONORA, CA 95370
Tuolumne County (209) 532-0511
MRS. JOANNE LINDA RIOS CNS
Clinical Nurse Specialist
900 GREENLEY RD, SUITE 905
SONORA, CA 95370
Tuolumne County (209) 536-3720
SHALOM EUGENE MARGOLIS M.D.
Specialist
900 GREENLEY RD, SUITE 911
SONORA, CA 95370
Tuolumne County (209) 532-0511
MEREDITH R MCBRIDE MD
Surgery (Vascular Surgery)
900 GREENLEY RD, SUITE 923
SONORA, CA 95370
Tuolumne County (209) 536-5090
WILLIAM G STONE MD
Surgery
900 GREENLEY RD
SONORA, CA 95370
Tuolumne County (605) 593-3688

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is James Mosson's NPI number?

The NPI number for James Mosson is 1437135670. It was assigned to this individual provider in the NPPES registry on December 20, 2005.

Where is James Mosson located?

James Mosson practices at 900 Greenley Rd Suite 922, Sonora, CA 95370. The listed phone number is (209) 536-3738.

What is James Mosson's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is James Mosson enrolled in Medicare?

Yes. James Mosson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for James Mosson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), James Mosson reassigns Medicare benefits to Mark Twain Health Care District (Valley Springs, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for James Mosson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for James Mosson was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.