Charta Health vs Nym Health (2026)
A clear technical contrast in autonomous coding, and it turns on compliance. Charta reviews documentation for every encounter before billing with large language models tuned to each client's review criteria, coding autonomously after the note closes, autocorrecting in the EHR or queuing problem charts for a person, with a citation behind every suggestion, and it measures its value as an 11 percent revenue uplift in RVUs per encounter. Nym assigns ICD-10 and CPT codes through rules based ontologies encoding AMA, CMS and WHO guidelines, which anchors coding to published guidance rather than a health system's past habits, and it publishes the rule that sends a chart to billing with no human review, coding confidence above 95 percent. Incorrect codes create False Claims Act exposure for the biller, so the direction a model drifts matters. If your failure mode is missed revenue across outpatient and ambulatory encounters, start with Charta. If it is compliance defensibility in emergency, radiology or other high volume service lines, start with Nym.
- Every encounter is reviewed before billing, with autonomous coding after the note closes, autocorrection in the EHR, or a queue for a person, and implementations tuned on each client's own review criteria.
- Each suggestion carries a citation to the supporting documentation, so an unsupported or invented code is checkable at review rather than found in an audit months later.
- It also serves payers, with retrospective and prospective risk adjustment, second pass QA, RADV audit management and HEDIS analytics, and it states SOC 2 and GDPR compliance with reports on request.
- Coding is anchored to published guidance, with rules based ontologies encoding AMA, CMS and WHO guidelines that Nym's compliance and clinical teams update with each guideline change.
- The routing rule is published. Encounters go straight to billing only when coding confidence exceeds 95 percent, and every code carries an audit trail of the findings and guidelines behind it.
- It covers six specialties and service lines, including emergency medicine, radiology, outpatient surgery and inpatient professional services, with Inova and Ochsner Health named among more than 30 health systems and physician groups.
This comparison is published by AI Health Index, an independent research platform that compares healthcare AI vendors objectively. Charta Health and Nym Health are each graded against the same capability taxonomy, from each vendor's own public materials and the regulatory record, under the AI Health Index verification standard. No vendor pays for placement, and no vendor has reviewed this page. How this evidence is graded
Plain facts
| Fact | Charta Health | Nym Health |
|---|---|---|
| Primary category | Autonomous Medical Coding | Autonomous Medical Coding |
| Founded | 2023 | Not recorded |
| Headquarters | San Francisco, California, United States | New York, New York, United States |
| Website | chartahealth.com | nym.health |
Side by Side
Select any grade to read the note behind it.
Each vendor in one paragraph
Written to be quoted whole. Each paragraph opens the AI Health Index profile of the vendor: what the product is, who buys it and what it does.
Charta Health reviews the documentation for every encounter before billing, using large language models rather than a rules engine. For providers it codes each visit after the note closes, corrects coding directly in the EHR or queues problem charts for a person, and cites the supporting documentation on each suggestion; revenue discovery, payer compliance, clinical quality analytics, clinical documentation improvement and provider feedback run on the same review.
Source: AI Health Index, July 2026
Autonomous medical coding engine that assigns ICD-10-CM/PCS and CPT codes from patient charts and routes encounters to billing with no human review when coding confidence exceeds 95 percent.
Source: AI Health Index, July 2026
Questions buyers ask
How do Charta Health and Nym Health work with the EHR?
Integration runs both ways in Charta's account: the platform reads all documentation after a note closes and can correct coding directly in the EHR, and the FAQ says it has integrated with dozens of commercial EHRs and homegrown EMRs.
With Nym Health, the company names no EHR, billing system, standard or listing. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified July 22, 2026. No vendor pays for placement.
How much do Charta Health and Nym Health leave to the clinician?
In Charta Health's case, the product pages pair that autonomy with absolute claims.
For Nym Health, the path for encounters below the threshold (return to the customer's coders) follows from that rule. From the AI Health Index, drawn from each vendor's own published materials and the regulatory record, verified July 22, 2026. No vendor pays for placement.
Related comparisons
Other published head to head assessments involving these vendors or their closest peers. The full set for this category is on the RCM & Prior Auth AI page.
Charta's value is measured in revenue uplift, and it says it verifies that E/M codes are billed at the highest defensible level, so a model tuned for capture can drift toward higher coding without any single chart showing it, and no governance evaluation is published to rebut that. Its product pages also promise to code every service completely and accurately, an absolute no review process can guarantee.
Nym publishes confidence rather than accuracy, and neither the audited accuracy above its threshold nor the share of charts that fall below it, by specialty. Charta's 98 percent accuracy claim is for payer risk adjustment projects and Nym's 98 percent figure dates from a 2021 post, and neither carries a method. Nym publishes no security attestation. Neither publishes a price.