Company lists · Data refreshed September 2026
Top 25 Billing and invoicing outsourcing companies based in the United States
RevenueBase identified 1,218 billing and invoicing outsourcing companies headquartered in the United States as of September 2026 and tracks 24,858 professional contacts across them, including 4,067 with verified work emails. New York is the largest hub.
This list covers billing and invoicing outsourcing companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 27, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest billing and invoicing outsourcing companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 3,677 contacts → | ||||
Indirect evidence “Transworld Systems Inc.(TSI) stands as the leading tech-driven provider in Accounts Receivable Management (ARM), Healthcare Revenue Cycle Management (RCM), Customer Experience…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,969 contacts → | ||||
Indirect evidence “Headquartered in Dallas, TX with over 2,500 employees worldwide, Credence Global Solutions offers technology, human resources and offsite infrastructure solutions and services…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,739 contacts → | ||||
Indirect evidence “Radius Global Solutions is a leading provider of accounts receivable, customer relations and revenue cycle management solutions.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 4 | 629 contacts → | ||||
Indirect evidence “Client Services, Inc.(CSI) was founded in 1987 in the heartland of America.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 5 | 571 contacts → | ||||
Indirect evidence “Founded in 2007, Metriqe Solutions started out as a Hotel Accounting firm in USA.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 6 | 527 contacts → | ||||
Partial evidence “QWay Technologies QWay is a global business outsourcing provider with a strong background of Revenue Cycle Management and providing customer support.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 7 | 455 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 8 | 447 contacts → | ||||
Indirect evidence “Velan Info Services is a leading multidisciplinary service provider with its clients across the globe.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 9 | 421 contacts → | ||||
Partial evidence “Are you tired of dealing with the hassle of medical billing and administrative tasks?” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 10 | 320 contacts → | ||||
Partial evidence “Unison Globus is a global accounting outsourcing and offshore staffing partner dedicated to supporting CPA firms and accounting professionals.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 11 | 254 contacts → | ||||
Partial evidence “Exponere Billing, LLC is among the leading billing companies.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 12 | 232 contacts → | ||||
Indirect evidence “NCO's Customer Fit Solutions are Custom Fit.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 13 | 231 contacts → | ||||
Partial evidence “TransCentra is one of the largest and most trusted billing and payments providers in the U.S.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 14 | 182 contacts → | ||||
Indirect evidence “GC Services provides award-winning customer care and account receivables management services to some of the most respected companies nationwide, including many Fortune 500…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 15 | 178 contacts → | ||||
Partial evidence “Allzone is a leading offshore Medical Billing Company that provides billing, coding and RCM (revenue cycle management) services to clients across USA.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 16 | 177 contacts → | ||||
Indirect evidence “MedSrv was established in 1985 and is based in Chattanooga, TN.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 17 | 176 contacts → | ||||
Indirect evidence “Zealie automates many touch points for the Behavioral Health and Substance Abuse Treatment Revenue Cycle Management (RCM) industry.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 18 | 168 contacts → | ||||
Partial evidence “Infinity Globus, a Springline company, is a leading accounting outsourcing firm with over two decades of industry experience, providing tailored taxation and accounting services…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 19 | 164 contacts → | ||||
Partial evidence “APS Medical Billing has been providing physician billing services since 1960.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 20 | 162 contacts → | ||||
Indirect evidence “Virrtue is a leading finance and accounting business process services team focused on delivering transformational financial outcomes to our customers.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 21 | 147 contacts → | ||||
Indirect evidence “Diversified Consultants, Inc.(DCI) is a business comprised of full service call centers specializing in Accounts Receivable Management functions with over 26 years of experience…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 22 | 147 contacts → | ||||
Partial evidence “Midatlantic Business Management Inc- “An AI Powered – B2B Demand Generation Platform”/ “A Complete Solution for your Outsourcing, Customer Service & Debt Collection Efforts” and…” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 23 | 134 contacts → | ||||
Partial evidence “Vertaccount is a boutique Finance and Accounting Outsourcing provider with offices and affiliates in the United States, Australia, Singapore and the Philippines.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 24 | 130 contacts → | ||||
Indirect evidence “helps companies scale in the by simplifying and transforming their - operations.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
| 25 | 129 contacts → | ||||
Partial evidence “Synter Resource Group is North America’s largest provider of comprehensive business process outsourcing (BPO) services in the transportation and logistics industry.” Source: RevenueBase Database · checked Sep 27, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: billing and invoicing outsourcing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names billing and invoicing outsourcing companies.
- Partial evidence
- Its own public description names part of billing and invoicing outsourcing companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name billing and invoicing outsourcing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 1,218 billing and invoicing outsourcing companies based in the United States
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Billing and invoicing outsourcing companies based in the United States at a glance
As of Sep 27, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,218 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among billing and invoicing outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “billing and invoicing outsourcing companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names billing and invoicing outsourcing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among billing and invoicing outsourcing companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 4,067 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 27, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Billing and invoicing outsourcing companies by metro
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names billing and invoicing outsourcing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many billing and invoicing outsourcing companies are there based in the United States?
RevenueBase identified 1,218 billing and invoicing outsourcing companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
TSI, headquartered in Federal Way, tops this list with the largest team on record.
Which city has the most billing and invoicing outsourcing companies?
New York leads with 35 headquartered companies, followed by Austin (29) and Houston (27).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 4,067 verified decision-maker contacts tracked across these 1,218 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 27, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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