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Our Data Sources
ClaimBack only displays statistics that can be directly cited to a primary public source. Below is a complete registry of every data source we use — with links, reporting periods, and the specific fields each source provides.
Our data policy: Where a field is not available from a primary, publicly-citable source, we display "not available" rather than an estimate. We do not extrapolate or fabricate statistics. See our methodology page for details.
🇺🇸 United States
Denial RatesUpdated: annual · Period: 2022
View Source →KFF — ACA Marketplace Claim Denials (MLR Filings)
Fields: in_network_denial_rate, out_of_network_denial_rate, appeal_rate, appeal_overturn_rate
Citation label: KFF analysis of insurer MLR filings · Last fetched: 2026-03-06
Denial RatesUpdated: annual · Period: 2022
View Source →CMS — Medicare Advantage Prior Authorization Denials
Fields: prior_auth_denial_rate, appeal_overturn_rate, service_denial_rate
Citation label: HHS OIG / CMS Medicare Advantage data · Last fetched: 2026-03-06
Complaint DataUpdated: annual · Period: 2023
View Source →NAIC — Insurance Complaint Ratios by Company
Fields: complaint_ratio, complaint_count, line_of_business, insurer_name
Citation label: NAIC Consumer Insurance Information Source · Last fetched: 2026-03-06
Denial RatesUpdated: annual · Period: 2022
View Source →KFF — Medicaid Managed Care Prior Authorization Denials
Fields: prior_auth_denial_rate, appeal_rate
Citation label: KFF Medicaid analysis · Last fetched: 2026-03-06
🇬🇧 United Kingdom
Complaint DataUpdated: annual · Period: 2022-23
View Source →Financial Ombudsman Service — Private Medical Insurance Complaints
Fields: complaint_count, upheld_rate, product_type
Citation label: Financial Ombudsman Service Annual Review · Last fetched: 2026-03-06
🇦🇺 Australia
Claims DataUpdated: quarterly · Period: 2023-Q4
View Source →APRA — Private Health Insurance Statistics
Fields: claims_paid, benefits_paid, insured_persons, fund_name
Citation label: APRA Private Health Insurance Statistics · Last fetched: 2026-03-06
Complaint DataUpdated: annual · Period: FY2022-23
View Source →AFCA — Health Insurance Complaint Data
Fields: complaint_count, product_type, issue_type, outcome
Citation label: AFCA Datacube · Last fetched: 2026-03-06
🇸🇬 Singapore
Complaint DataUpdated: annual · Period: 2022
View Source →FIDReC — Financial Industry Disputes (Singapore)
Fields: case_count, product_type, outcome
Citation label: FIDReC Annual Statistics · Last fetched: 2026-03-06
Claims DataUpdated: annual · Period: 2022
View Source →MAS — Singapore Insurance Statistics
Fields: claims_ratio, premiums_written, claims_incurred, product_type
Citation label: MAS Insurance Statistics · Last fetched: 2026-03-06
🇨🇦 Canada
Complaint DataUpdated: annual · Period: 2022-23
View Source →PHIO — Private Health Insurance Ombudsman (Canada)
Fields: complaint_count, issue_type, outcome
Citation label: PHIO Annual Report · Last fetched: 2026-03-06
Complaint DataUpdated: annual · Period: 2022
View Source →OLHI — OmbudService for Life & Health Insurance (Canada)
Fields: complaint_count, issue_type, resolution_type
Citation label: OLHI Annual Report · Last fetched: 2026-03-06