Dr. William G Stone , MD
Surgery • Sonora, CA
900 Greenley Rd
Sonora, CA 953705287
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on April 15, 2008; this date does not establish years in practice.
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Published CMS data list 157 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99232 — Subsequent hospital care with moderate levelof medical decision making: 50 service units.
- 99223 — Initial hospital care with moderate level of medical decision making: 41 service units.
- 99222 — Initial hospital care with straightforward or low-level medical decision making: 36 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 4 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 21 Medicare Part D prescriptions, including refills, in 2022.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2022. Published rows only; this is not a quality measure.
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Published Part D records, 2022:
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 21 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2022. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 60% of clinicians listed under Surgery in California (2024, 1,346 clinicians with data). Median for this group: 213. Middle half: 101 to 404.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 134 in 2020 to 157 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
900 Greenley Rd
Sonora, CA 953705287
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
109 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $16,934 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $13,207 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
21 standardized 30-day fills in 2022
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$142 in 2022
The total cost of these prescriptions in 2022, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2022.
Open Payments general payments, program year 2024
All general payments: $88.94 across 4 records.
By nature of payment
- Food and Beverage: $88.94 across 4 records.
Reporting-company totals
- MDD US Operations, LLC: $88.94 across 4 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2024 (published June 30, 2026).
NPI first issued
2008
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Stone has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Stone as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Sonora and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 60% of clinicians listed under Surgery in California (2024, 1,346 clinicians with data). Median for this group: 213. Middle half: 101 to 404.
Too few clinicians listed under Surgery in Sonora have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A lower Medicare-allowed amount than 65% of clinicians listed under Surgery in California (2024, 1,346 clinicians with data). Median for this group: $32,453. Middle half: $13,159 to $66,109.
Too few clinicians listed under Surgery in Sonora have Medicare Part B data for 2024 to compare.
Paid by Medicare
A lower Medicare payment amount than 65% of clinicians listed under Surgery in California (2024, 1,346 clinicians with data). Median for this group: $24,935. Middle half: $10,148 to $50,637.
Too few clinicians listed under Surgery in Sonora have Medicare Part B data for 2024 to compare.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Stone are from 2022.
8 active clinicians are listed under Surgery with a practice address in Sonora, CA (3,120 in California).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 17% from 134 in 2020 to 157 in 2024.
- 2020: 134
- 2021: 302
- 2022: 189
- 2023: 71
- 2024: 157
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Medicare-allowed amount
Medicare-allowed amount varied from year to year: $16,272 in 2020 and $16,934 in 2024.
- 2020: $16,272
- 2021: $39,380
- 2022: $21,352
- 2023: $8,547
- 2024: $16,934
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Paid by Medicare
Paid by Medicare varied from year to year: $12,968 in 2020 and $13,207 in 2024.
- 2020: $12,968
- 2021: $29,321
- 2022: $14,739
- 2023: $6,366
- 2024: $13,207
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 78% from 95 in 2018 to 21 in 2022.
- 2018: 95
- 2019: 71
- 2020: 13
- 2021: 22
- 2022: 21
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30-day fills
30-day fills decreased 78% from 95 in 2018 to 21 in 2022.
- 2018: 95
- 2019: 71
- 2020: 13
- 2021: 22
- 2022: 21
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Part D drug cost
Part D drug cost decreased 87% from $1,112 in 2018 to $142 in 2022.
- 2018: $1,112
- 2019: $836
- 2020: $51
- 2021: $105
- 2022: $142
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $107.11 in 2019 to $88.94 in 2024.
- 2019: $107.11
- 2020: $21.32
- 2021: $37.95
- 2024: $88.94
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2022), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 – December 31, 2024): fewer than 11 records totaling $88.94.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| MDD US Operations, LLC |
Food and Beverage
In-kind items and services
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Gocovri | General | $23.54 |
| MDD US Operations, LLC |
Food and Beverage
In-kind items and services
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Gocovri | General | $23.54 |
| MDD US Operations, LLC |
Food and Beverage
In-kind items and services
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Gocovri | General | $21.59 |
| MDD US Operations, LLC |
Food and Beverage
In-kind items and services
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Gocovri | General | $20.27 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
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50 | 32 | $161.00 | $77.47 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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41 | 40 | $353.00 | $170.68 |
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99222
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
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36 | 34 | $264.00 | $127.90 |
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99231
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes
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30 | 21 | $100.00 | $48.60 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2022.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 21 | 93 | $141.70 | 16 |
Source: CMS Part D by Provider and Drug, 2022; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2022-04-30NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL SURGERY
I20120904000682
SD
5395992960
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Specialist
Doctor of Medicine (M.D.)
Physician Assistant - Surgical
Physician Assistant (Certified)
Specialist
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Clinical Nurse Specialist
Clinical Nurse Specialist
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Surgery (license number reported to NPPES: SD 8495)
Registered at 900 GREENLEY RD, SONORA, CA 953705287 (Tel: 6055933688)
Registered at 18200 OLD WARDS FERRY ROAD, SONORA, CA 95370 (Tel: 6055933688)
Surgery (license number reported to NPPES: CA C167208)
Registered at 904 QUINCY ST, # 2, RAPID CITY, SD 577012608 (Tel: 6057915553)
NPI status registered as active in NPPES database
Registered at 2805 5TH ST, 100, RAPID CITY, SD 577017306 (Tel: 6057195700)
Registered at 904 QUINCY ST, # 2, RAPID CITY, SD 577012608
Recorded as WILLIAM STONE, MD
Surgery (license number reported to NPPES: SD 8495)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Surgery Specialists in Sonora
Mailing Address
18200 Old Wards Ferry Road
Sonora, CA 95370