Clin Orthop Relat Res
Arthroplasty, Replacement, KneeBody Mass IndexChi-Square Distribution
Dr. Christopher A. Walter, DO
NPI1447420732PAC ID8224184635
- Medicare services, 2024
- 1,942
- Medicare patients, 2024
- 296
- Part D claims, 2024
- 167
- Publications
- 1
- Hospital affiliations
- 5
- Practice address
- 347 Andrieux St, Sonoma, CA 95476
- Practice phone
- Call (707) 935-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Walter's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Christopher A. Walter is an orthopedic surgeon in Sonoma, California
Dr. Walter practices at Sonoma Valley Hospital in Sonoma, California, part of Sonoma Valley Hospital.
Dr. Walter's NPI, 1447420732, was assigned on March 3, 2008. Dr. Walter graduated from Touro University California - Vallejo in 2004. Dr. Walter holds California license 20A10826.
NPI and contact details
- NPI
- 1447420732NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8224184635
- NPI enumeration date
- March 3, 2008
- NPI status
- Active
- Practice phone
- (707) 935-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Christopher A. Walter practices at Sonoma Valley Hospital in Sonoma, California
Dr. Walter's primary practice is Sonoma Valley Hospital, at 347 Andrieux St, Sonoma, CA 95476 in Sonoma County. The practice phone is (707) 935-5000.
- Sonoma Valley Hospital347 Andrieux St, Sonoma, CA 95476 · Sonoma CountyPhone(707) 935-5000
Source: Dmand AI Affiliation Data
Dr. Christopher A. Walter is affiliated with 6 sites of care and 1 medical group
Dr. Walter's primary practice is Sonoma Valley Hospital in Sonoma, California, part of Sonoma Valley Hospital. Dr. Walter is also affiliated with UCSF Helen Diller Medical Center at Parnassus Heights. The medical group on file is UCSF Medical Group. Dmand AI also links Dr. Walter to 3 more hospitals and 1 physician office, each named with a free account.
UCSF Helen Diller Medical Center at Parnassus HeightsUCSF Medical Group3 hospitalsNames with a free account1 physician officeName with a free account
See all 7 affiliations for Dr. WalterSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Christopher A. Walter's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walter practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sonoma Valley Hospital | Available with a free account |
| +5 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every hospital where Dr. Walter practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across Sonoma Valley Hospital and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Christopher A. Walter is one of 2,056 orthopedic surgeons in California
Orthopaedic surgery is Dr. Walter's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Walter is board certified in orthopedic surgery by the AOA Board of Orthopedic Surgery. Dmand AI has Dr. Walter's licenses on file in 5 states: California, Nevada, Indiana, Minnesota and Ohio.
Specialties and state licenses
- Orthopaedic surgery, CaliforniaPrimary
- Nevada license
- Indiana license
- Minnesota license
- Ohio license
Clinical focus
Dmand AI lists arm, wrist, hand fracture and dislocation, arthritis, carpal tunnel syndrome, hand joint or tendon inflammation, joint pain, knee arthroscopy, knee injury and lower back pain among the conditions Dr. Walter treats.
Orthopedic surgeons near Dr. Walter
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
2,056orthopedic surgeons in California
2orthopedic surgeons in Sonoma
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Christopher A. Walter billed Medicare for 1,942 services in 2024
CMS data shows 1,942 Medicare services from Dr. Walter across 7 procedure codes in 2024, for 296 Medicare patients. Medicare paid $46,737 for them. Every service was in an office.
Medicare services, 20241,942
Medicare patients296
Paid by Medicare$46,737
Procedure codes7
Dr. Walter's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 392024: 1,4113518%
- Office and hospital visits
- 2023: 2982024: 48563%
- Surgery
- 2023: 222024: 46109%
- Imaging
- 2023: 212024: 0100%
Dr. Walter compared with the California median for orthopedic surgeons, 2024
- Dr. Walter
- California median
- Medicare services
- 1,942vs 6832.8 times
- Medicare patients
- 296vs 21538% above
- Part D claims
- 129vs 7084% above
Medians across 1,844 orthopedic surgeons in California with Dmand AI profiles that report each measure.
Dr. Walter's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Walter?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Walter and other orthopedic surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christopher A. Walter treated 296 Medicare patients in 2024, average age 76
CMS counts 296 Medicare patients who saw Dr. Walter in 2024. The largest group is 75 to 84, with 119 patients. 75% of them have arthritis, and 75% have high cholesterol. 15% are also on Medicaid. Their average risk score is 1.11, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Walter's median patient age at 70, with 54% women.
Medicare patients, 2024296
Average age76
Average risk score1.11
Also on Medicaid15%
Dr. Walter's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Walter's Medicare patients by sex, 2024
- Women18061%
- Men11639%
Chronic conditions among Dr. Walter's Medicare patients, 2024
- Arthritis75%
- High cholesterol75%
- High blood pressure69%
- Ischemic heart disease25%
- Mood disorders25%
- Anxiety22%
- Diabetes22%
- Depression21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Walter's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women54%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christopher A. Walter wrote 167 Medicare Part D claims in 2024
In 2024, Dr. Walter wrote 167 Medicare Part D claims for 61 patients. 100% of them were for generic drugs. CMS names the drug for 129 of them, across 5 drugs with 11 or more claims each, at $3,025 in total drug cost. In 2023, CMS named 252 claims across 6 drugs.
Part D claims, 2024167
Drugs named by CMS5
Total drug cost$3,025
Part D patients61
Dr. Walter's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Walter's Part D claims, 2024
- Opioids19%31 of 167 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2522024: 12949%
Drugs named by CMS: 5 in 2024, 6 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Christopher A. Walter ranks in the 92nd percentile for lower limb (leg) arthroscopy (minimally invasive joint repair) in Medicare
CMS counts 20 procedures of lower limb (leg) arthroscopy (minimally invasive joint repair) by Dr. Walter, more than 92% of the clinicians it reports for that procedure.
Where Dr. Walter ranks in Medicare procedure volume
- Lower limb (leg) arthroscopy (minimally invasive joint repair)
- 92nd percentile20 procedures
- Knee replacement
- 53rd percentile20 procedures
- Upper limb (arm) arthroscopy (minimally invasive joint repair)
- 55th percentile15 procedures
- Hip replacement
- 57th percentile14 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Source: Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Find orthopedic surgeons like Dr. Walter by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Christopher A. Walter has 1 publication on record
Dmand AI links 1 paper to Dr. Walter in 2009. Dr. Walter's most frequent co-author is Keith R. Berend, MD.
Papers1
Dr. Walter's most frequent co-authors
Recent publications by Dr. Walter
See who Dr. Walter researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Walter works with, so you can find a warm path to the right orthopedic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Christopher A. Walter received $15,409 in industry payments from 2016 to 2025
CMS Open Payments shows 78 general payments to Dr. Walter from 12 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 42% of the total. Evolution Surgical, Inc paid the most, $6,770.
General payments to Dr. Walter by program year, 2016 to 2025
General payments to Dr. Walter by kind, 2016 to 2025
$15.4Kin total
- Travel and lodging$6,54242%
- Education$4,33828%
- Food and beverage$3,72924%
- Consulting fees$8005%
Companies that paid Dr. Walter the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Christopher A. Walter has 1 award and honors on record
Dmand AI lists 1 award for Dr. Walter, most recently CMS Stage 1 EHR in 2012.
Awards and honors for Dr. Walter
- 2012
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Christopher A. Walter graduated from Touro University California - Vallejo
Dr. Walter graduated from Touro University California - Vallejo in 2004. Dr. Walter is a member of AOA and AOAO.
- Medical school
- Board certified in orthopedic surgery
Source: Dmand AI Professional Profile Data
Dr. Christopher A. Walter accepts plans from 9 insurance carriers
Dr. Walter is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Blue Cross and Blue Shield of Kansas City
- +1 more carriersWith a free account
Plan types Dr. Walter accepts, by number of carriers
- Medicare8
- PPO7
- HMO4
- POS4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. Christopher A. Walter's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Christopher A. Walter
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Christopher A. Walter's NPI number?
Dr. Christopher A. Walter's NPI number is 1447420732. It was assigned on March 3, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Christopher A. Walter?
Dr. Christopher A. Walter is an orthopedic surgeon in Sonoma, California. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Christopher A. Walter practice?
Dr. Walter practices at 347 Andrieux St, Sonoma, CA 95476. Dr. Walter's primary practice is Sonoma Valley Hospital in Sonoma, California, part of Sonoma Valley Hospital. Dmand AI also links Dr. Walter to 3 hospitals and 1 physician office.
What is Dr. Christopher A. Walter's office phone number?
The practice phone on file for Dr. Walter is (707) 935-5000.
What is Dr. Christopher A. Walter's medical license number?
Dr. Walter holds California license 20A10826, one of the licenses on file in 5 states.
Which states has Dr. Christopher A. Walter been licensed in?
Dmand AI has state licenses on file for Dr. Walter in California (2009 to 2026), Nevada (2009 to 2012), Indiana (2009 to 2011), Minnesota (2009 to 2010) and Ohio (2004 to 2009).
Which hospitals is Dr. Christopher A. Walter affiliated with?
Dr. Walter practices at Sonoma Valley Hospital in Sonoma, California. Dr. Walter is also affiliated with UCSF Helen Diller Medical Center at Parnassus Heights. Dmand AI links Dr. Walter to 3 more hospitals.
What medical group is Dr. Christopher A. Walter part of?
Dr. Walter is linked to UCSF Medical Group.
Does Dr. Christopher A. Walter accept Medicare?
Yes. CMS data shows Dr. Walter billed Medicare for 1,942 services in 2024.
How many Medicare patients does Dr. Christopher A. Walter see?
CMS counts 296 Medicare patients who saw Dr. Walter in 2024, with an average age of 76.
Show 9 more questionsShow fewer questions
Is Dr. Christopher A. Walter board certified?
Yes. Dr. Walter is board certified in orthopedic surgery by the AOA Board of Orthopedic Surgery.
What services does Dr. Christopher A. Walter bill to Medicare?
In 2024, Dr. Walter's most billed Medicare services were injected or infused drug (J1010), office visit, established patient (99213) and office visit, established patient (99214).
Where did Dr. Christopher A. Walter go to medical school?
Dr. Walter graduated from Touro University California - Vallejo in 2004.
What drugs does Dr. Christopher A. Walter prescribe most?
In 2024 Medicare Part D data, Dr. Walter's most prescribed drugs by claims were Ibuprofen, Celecoxib and Ondansetron ODT.
Has Dr. Christopher A. Walter received payments from drug or device companies?
CMS Open Payments shows $15,409 in general payments to Dr. Walter from 12 companies from 2016 to 2025. The largest total came from Evolution Surgical, Inc.
How long has Dr. Christopher A. Walter been practicing?
Dr. Walter graduated from medical school in 2004, 22 years ago.
Does Dr. Christopher A. Walter do research?
Dmand AI links 1 publication to Dr. Walter.
Who does Dr. Christopher A. Walter publish with?
Dr. Walter's most frequent co-authors are Keith R. Berend, MD (1 shared paper).
What insurance does Dr. Christopher A. Walter accept?
Dr. Walter is in network with 9 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
Selling to orthopaedic surgery practices?
See orthopedic surgeons in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card