Active NPI 1447420732 Individual Practitioner Male Practitioner

Dr. Christopher A Walter , DO

Orthopaedic Surgery • Sonoma, CA

Professional Overview & Biography Verified Profile Summary

Dr. Christopher Walter, DO is a certified Orthopaedic Surgery practicing in Sonoma, CA. With approximately 22 years of clinical experience since graduating from College Of Osteopathic Physicians And Surgeons Of Los Angeles in 2004, Dr. Walter delivers high-quality medical care to the local community at 347 ANDRIEUX ST.

Dr. Walter is affiliated with Regents Univ Of California Ucsf and does not directly accept Medicare assignment.

Frequently performed procedures and clinical services include injection, methylprednisolone acetate, 1 mg, established patient outpatient office visit, new patient outpatient office visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

347 Andrieux St

Sonoma, CA 954766811

Telephone 7077218830

Associated Practice Facility / Clinic

🏢 Ralph T. Mitarai, M.d., Professional Corporation Facility NPI 1871587469

Medicare Profile & Education

Medical School

College Of Osteopathic Physicians And Surgeons Of Los Angeles

Graduation Year

2004

Medicare Assignment

Not Specified

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Orthopaedic Surgery in Sonoma, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

22 Yrs -11.8 yrs vs City Avg

City Avg: 33.8 Yrs

State Avg: 28.4 Yrs

Regional Practice Density

8 Specialists

Practicing in Sonoma, CA (2527 Statewide)

Telehealth Adoption Rate

12.5% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

76.8% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Walter (22 Years) 22 Yrs

Sonoma Specialty Average (33.8 Years) 33.8 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J1010 Injection, methylprednisolone acetate, 1 mg	1,411	18	$0.63	$0.12
99213 Established patient office or other outpatient visit, typically 15 minutes	201	139	$354.65	$96.42
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	151	120	$557.53	$133.31
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	72	72	$807.89	$172.38
20610 Aspiration and/or injection of fluid from large joint	46	42	$334.46	$71.86
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	42	42	$514.33	$116.49
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	19	19	$238.68	$59.61

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	144	98	$245.00	$98.05
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	75	67	$345.00	$136.17
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	50	50	$447.00	$177.08
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	39	11	$16.00	$1.09
20610 Aspiration and/or injection of fluid from large joint	22	18	$193.09	$77.04
73030 X-ray of shoulder, minimum of 2 views	21	16	$99.00	$40.44
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	17	17	$302.00	$121.36
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	12	12	$350.00	$135.45

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	105	74	$245.00	$99.90
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	89	68	$345.00	$140.77
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	79	79	$447.00	$181.50
20610 Aspiration and/or injection of fluid from large joint	29	22	$183.10	$74.84
73030 X-ray of shoulder, minimum of 2 views	19	17	$99.00	$40.84
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	14	14	$302.00	$123.54
99221 Initial hospital inpatient care per day, typically 30 minutes	14	14	$259.00	$105.69
J1040 Injection, methylprednisolone acetate, 80 mg	13	11	$40.00	$11.47
29827 Repair of shoulder rotator cuff using an endoscope	12	12	$2856.00	$1163.81
29826 Shaving of part of shoulder bone and repair of ligament using an endoscope	12	12	$450.00	$182.74

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	142	91	$195.00	$143.13
99213 Established patient office or other outpatient visit, typically 15 minutes	66	48	$132.00	$101.05
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	51	51	$296.00	$183.80
J1040 Injection, methylprednisolone acetate, 80 mg	31	24	$40.00	$10.66
20610 Aspiration and/or injection of fluid from large joint	28	24	$181.71	$76.18
73030 X-ray of shoulder, minimum of 2 views	21	14	$69.00	$39.73
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	16	16	$197.00	$123.66
99221 Initial hospital inpatient care per day, typically 30 minutes	14	14	$159.00	$106.75
29826 Shaving of part of shoulder bone and repair of ligament using an endoscope	12	12	$2234.00	$185.14
29827 Repair of shoulder rotator cuff using an endoscope	12	12	$3523.00	$1167.92

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	136	81	$195.00	$119.08
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	37	37	$197.00	$117.97
99213 Established patient office or other outpatient visit, typically 15 minutes	32	30	$132.00	$82.46
J1040 Injection, methylprednisolone acetate, 80 mg	26	19	$40.00	$11.54
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	25	25	$296.00	$178.23
20610 Aspiration and/or injection of fluid from large joint	23	20	$193.57	$75.48
73502 X-ray of hip, 2-3 views	15	11	$115.00	$51.49
99221 Initial hospital inpatient care per day, typically 30 minutes	14	14	$159.00	$108.45
73030 X-ray of shoulder, minimum of 2 views	12	11	$69.00	$37.61

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	184	112	$192.68	$115.90
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	51	51	$194.49	$115.51
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	45	45	$290.62	$174.41
20610 Aspiration and/or injection of fluid from large joint	42	35	$174.14	$66.97
J1040 Injection, methylprednisolone acetate, 80 mg	34	29	$40.00	$12.13
99213 Established patient office or other outpatient visit, typically 15 minutes	32	26	$129.66	$77.81
73564 X-ray of knee, 4 or more views	21	20	$77.00	$46.25
73502 X-ray of hip, 2-3 views	20	16	$115.00	$47.87
99221 Initial hospital inpatient care per day, typically 30 minutes	18	18	$159.00	$104.91

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	125	81	$183.68	$113.15
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	48	48	$187.17	$112.78
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	41	41	$278.41	$169.07
20610 Aspiration and/or injection of fluid from large joint	39	24	$167.15	$64.60
J1040 Injection, methylprednisolone acetate, 80 mg	37	22	$40.00	$12.91
99213 Established patient office or other outpatient visit, typically 15 minutes	30	23	$124.20	$76.68
73502 X-ray of hip, 2-3 views	19	13	$115.00	$44.97
99221 Initial hospital inpatient care per day, typically 30 minutes	18	18	$159.00	$103.28
73030 X-ray of shoulder, minimum of 2 views	16	16	$69.00	$31.77

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	116	89	$168.00	$111.38
99213 Established patient office or other outpatient visit, typically 15 minutes	65	54	$114.77	$75.87
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	40	40	$181.00	$111.78
20610 Aspiration and/or injection of fluid from large joint	31	26	$169.26	$64.39
J1040 Injection, methylprednisolone acetate, 80 mg	27	23	$40.00	$10.90
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	27	27	$258.00	$169.19
73030 X-ray of shoulder, minimum of 2 views	13	12	$69.00	$30.87
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	11	11	$258.00	$139.38

Medical Specialties & State Licenses

CMS Verified: 2026-03-13

Orthopaedic Surgery Primary Specialty

NUCC Taxonomy Code: 207X00000X

State License CA 20A10826

An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

Hospital & Practice Group Affiliations

Regents Univ Of California Ucsf

505 Parnassus Ave, San Francisco, CA 941432204

Phone: 4154761000

Secondary Practice Locations

335 S Mcdowell Blvd

Petaluma, CA 949543507

Phone: 7077218830

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

1 Associated Practitioners

Sarah Slough

Physician Assistant

NPI 1912659806

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

8 Historical Events

📍

Updated Business Mailing Address March 13, 2026

Registered at 347 ANDRIEUX ST, SONOMA, CA 954766811 (Tel: 7077218830)

📍

Updated Practice Location May 17, 2024

Registered at 347 ANDRIEUX ST, SONOMA, CA 954766811 (Tel: 7077218830)

✅

NPI Profile Active August 04, 2010

NPI status registered as active in NPPES database

📍

Updated Practice Location August 04, 2010

Registered at 20990 REDWOOD RD, CASTRO VALLEY, CA 945465918 (Tel: 5107331532)

📍

Updated Business Mailing Address August 04, 2010

Registered at 20990 REDWOOD RD, CASTRO VALLEY, CA 945465918 (Tel: 5107331532)

👤

Provider Name / Credentials Updated August 04, 2010

Recorded as CHRISTOPHER WALTER, D.O.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) August 04, 2010

Orthopaedic Surgery (License #20A10826 in CA)

🟢

Initial NPI Registration & Enumeration March 03, 2008

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

0 Reviews

No patient reviews submitted yet for Dr. Christopher Walter. Be the first to share your experience!

Only verified registered users can submit ratings, post feedback, and upload facility photos.

NPI Administrative Meta

NPI Number: 1447420732

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: March 03, 2008

Last Update: March 13, 2026

Sole Proprietor: No

Update or Correct Profile

Mailing Address

347 Andrieux St

Sonoma, CA 954766811

Phone: 7077218830

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.