Provider directories have a well-documented accuracy problem. Health plans publish addresses for millions of providers, but a significant portion are outdated, duplicated, or simply wrong. For any platform that depends on this data — whether for care navigation, plan shopping, or in-network provider search — the result is a broken user experience: members directed to offices that no longer exist, calls to disconnected numbers, and eroded trust in the tools meant to help them.
Ideon's Address Confidence Score is a direct response to this industry-wide challenge, built into IdeonSelect, Ideon's provider network data API.
The core problem: directories are slow to shrink
Health plan provider directories grow faster than they are cleaned up. New provider-address records are added regularly as providers join networks, open new locations, or update their credentials. But stale records — old addresses, closed offices, providers who've left a network — are removed at a much slower rate. The result is a directory structurally biased toward accumulating outdated data over time.
This isn't a failure of any single health plan. It's an artifact of how directories are maintained across the industry. And it's why even well-resourced platforms that pull directly from carrier sources still encounter inaccurate location data at scale.
What address confidence scores do
Ideon's Address Confidence Score assigns a High, Medium, or Low rating to every provider address in its dataset — covering more than 19 million unique addresses across 3 million individual providers. The scores reflect the likelihood that a provider is actually practicing at a given address, based on a machine learning model trained on manually verified data.
| Score | What it means | Validation rate (in testing) | Recommended display action |
|---|---|---|---|
| High | Provider is very likely practicing at this address | >85% confirmed valid | Show prominently; sort first |
| Medium | Roughly a coin flip on whether the provider sees patients here | ~50% confirmed valid | Show with optional caveat flag |
| Low | Provider is very likely not at this address | >93% confirmed invalid | Filter out when High alternatives exist; show with strong caveat otherwise |
| Unscored | Only one carrier source exists for this provider — insufficient signal | Treat as Medium | Show with same caveat as Medium |
Ideon built the verification dataset underlying the model by directly calling a statistically significant, representative sample of providers to confirm addresses — then split that data into training and test groups to develop and validate a predictive model.
How the model works
Two factors emerged as the strongest predictors of address accuracy across the full provider network dataset:
Frequency
How often does this address appear across Ideon's carrier data sources over time? Ideon ingests data from more than 600 carrier sources, accounting for billions of provider addresses. An address that consistently appears across many sources and recent refreshes is much more likely to be accurate than one that surfaces only occasionally or from a single source. Recency is factored in — a frequent address from an older refresh carries less weight than a frequent address from a current one.
Distance
How far is this address from the weighted center point of all addresses associated with the provider? Ideon calculates a weighted geographic center based on all addresses for a given provider (identified by NPI), then evaluates each address against that center. Addresses that are geographically anomalous relative to a provider's known practice locations score lower.
Note: Scores are applied only to individual providers (defined by the type field in Ideon's dataset). Provider organizations and facilities are excluded from scoring.
Score distribution: what to expect
Slightly more than half of all provider addresses score Low. That reflects the structural issue described above — directories accumulate stale records over time. It also reflects variation across carrier sources: some health plans maintain much more accurate directories than others.
| Dimension | What varies | Detail |
|---|---|---|
| Overall distribution | ~50%+ score Low; most of the remainder score High | Consistent across all products and markets in Ideon's dataset |
| By carrier source quality | Most accurate carriers: >50% High; least accurate: >75% Low | Source quality varies significantly across health plans |
| By specialty — highest scored | Psychology, pediatrics, family medicine | Stable practice locations drive consistent address signals |
| By specialty — lowest scored | Radiology, anesthesiology | Itinerant practice patterns generate many addresses, most stale |
How to implement address confidence scores
For most member-facing provider search applications, Ideon recommends a dynamic filtering approach at two levels. Full implementation guidance is in the Address Confidence Score documentation.
Provider level — for each provider returned in a search
- If a provider has addresses at multiple confidence levels (High + Medium + Low, or Medium + Low), filter out the Low addresses
- If all of a provider's addresses are Low, keep them — don't drop the provider entirely
- Sort displayed addresses with High-confidence addresses first
Search level — across all providers returned
- If enough High-confidence providers meet your volume threshold, deprioritize providers with only Medium or Low addresses
- If not enough High-confidence providers are available (common in rural areas), surface the remaining providers anyway
- Use Address Confidence Score as a factor in your provider-level sorting algorithm
Ideon also recommends showing a warning flag or UI notification when Medium or Low-confidence addresses are displayed — giving users the context they need to verify before traveling to a location.
Why this matters for care navigation platforms
For platforms helping members find in-network care, bad address data doesn't just create friction — it creates a trust problem. A member who travels to a provider's listed address and finds an empty office is unlikely to rely on that tool again.
Address Confidence Scores give platforms a systematic, data-driven way to surface the most reliable location information first, while still returning results in low-density areas where aggressive filtering would leave users with nothing. The scoring is available via the IdeonSelect provider search response alongside all other provider data — network participation, specialties, and cost and quality ratings — with no separate data pipeline required.
Frequently asked questions
What is a provider address confidence score?
A provider address confidence score is a data quality rating — High, Medium, or Low — that indicates the likelihood a healthcare provider is actually seeing patients at a given address. Ideon's Address Confidence Score is generated by a machine learning model trained on manually verified data, using address frequency across 600+ carrier sources and geographic distance from a provider's known practice locations as the two primary signals.
How accurate are the scores?
In testing against manually verified data: High addresses were confirmed valid more than 85% of the time. Medium addresses were valid roughly 50% of the time. Low addresses were confirmed invalid more than 93% of the time.
Why do so many addresses score Low?
Provider directories accumulate stale records over time because new entries are added faster than outdated ones are removed. This structural bias means slightly over 50% of addresses in Ideon's dataset score Low — concentrated in old or single-source records.
Should I filter out all Low addresses?
No. Filtering all Low addresses can eliminate providers in rural areas or networks with lower-quality directories, leaving users with no results. Ideon's recommended implementation uses dynamic filtering: remove Low addresses when High alternatives exist for the same provider, but preserve them when they're the only data available.
Explore the full technical documentation for Address Confidence Scores in Ideon's API guide, including field definitions and response examples for the provider search response. To learn about IdeonSelect and how it powers provider search for care navigation platforms, visit ideonapi.com/ideon-select.