Home Sleep Testing Is Getting a Shiny Complexity-Based Coding System
(Sleep Review | Aug 11, 2026 | By Sree Roy | See full article.)
Complexity would be determined by the channels acquired and the parameter categories reviewed—not simply by the capabilities of the testing device.
This topic is especially relevant to SleepEdu.org’s audience because the changes could affect sleep technologists, physicians, sleep center managers, billing teams, and other professionals involved in home sleep apnea testing. Practices may need to update documentation procedures, testing workflows, billing systems, prior-authorization processes, and staff training before the anticipated January 1, 2027, implementation date. Final guidance is still forthcoming, making it important for sleep professionals to follow developments closely and avoid making decisions based solely on preliminary interpretations.
Read the full article, “Home Sleep Testing Is Getting a Shiny Complexity-Based Coding System,” written by Sree Roy and published by Sleep Review, for a closer look at the proposed complexity tiers, separation of technical and professional services, documentation expectations, reimbursement concerns, and steps practices can take to prepare.
Read the full article from Sleep Review
Original reporting and article credit: Sree Roy, Sleep Review. This introduction is provided by SleepEdu.org for educational awareness and does not constitute coding, billing, or legal advice.
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Beginning in 2027, unattended sleep studies will be described as low-, moderate-, or high-complexity, based on the channels acquired and parameter categories reviewed—not on the device used.
By Sree Roy
The regulatory framework overhaul for home sleep testing moves forward with its most significant revision in nearly two decades. Following years of collaboration between the American Academy of Sleep Medicine (AASM) and other specialty societies, the Centers for Medicare & Medicaid Services (CMS) published a proposed new family of Current Procedural Terminology (CPT) codes for unattended sleep testing in the Federal Register on July 16, 2026. The public comment period is open until Sept 14, 2026. The new code set is scheduled to take effect Jan 1, 2027.
The update replaces the current code set—95800, 95801, and 95806—with six new codes designed to reflect the diversity of modern sleep testing technology. Unlike the previous codes, which were defined by specific hardware requirements like airflow or peripheral arterial tone, the new structure stratifies studies by the complexity of channels acquired and the parameter categories reviewed.
“These new codes represent an important step toward modernizing how unattended sleep testing is reported and valued,” says AASM president Fariha Abbasi-Feinberg, MD, in an AASM article (published July 15) regarding the proposed rule. “As sleep testing technologies and clinical applications continue to evolve, coding must keep pace with current clinical practice.”
Three Complexity Tiers
The outgoing codes were established in 2008, a time when home testing was primarily a binary tool for diagnosing obstructive sleep apnea (OSA). Since then, the field has seen a proliferation of technologies capable of measuring mandibular jaw movement, cardiac rhythms, and sleep-wake characterization.
Under the new 2027 framework, the study is defined by its complexity level, not by a specific HST device. The codes are divided into three tiers:
- Low Complexity (95X18/95X21): 3 to 4 channels generating at least 3 to 5 parameter categories
- Moderate Complexity (95X19/95X22): 5 to 10 channels generating at least 6 to 8 parameter categories.
- High Complexity (95X20/95X23): 11 or more channels generating at least 9 parameter categories.
Vikas Jain, MD, FAASM, an AASM CPT advisor, emphasizes that a device does not inherently possess a complexity level. Instead, the specific study performed dictates the code. “You could have a device capable of measuring 12 channels, but you only use five channels,” Jain says. “Follow the study; do not follow the hardware.” In other words, questions to ask include: What channels can I prove that I acquired, reviewed, and used?
This shift provides flexibility for modular devices where a physician might use different sensor configurations for different patients. For example, a primary care physician might only require a low-complexity study for a straightforward OSA screen, while a sleep specialist might utilize high-complexity channels to evaluate REM-related AHI or positional apnea.
Etai Amitai, vice president of strategic planning and health economics at ZOLL Itamar, which has been an “interested party” in the code development process, also stresses that “the code selection is ultimately based on what the provider actually analyzes and understands from the data acquired.” He explains that if a device measures 10 channels but the physician only interprets parameters in five categories, the study must be billed as low complexity. “To qualify for higher complexity codes, it is not sufficient for the device to measure additional channels,” Amitai says. “The provider needs to score and interpret a sufficient number of parameters and capture enough parameter categories.”
This flexibility is supported by device manufacturers offering setups that adapt to different patient needs. Fred Turkington, senior vice president of product management at EnsoData, notes here that having a modular system has advantages. “Being an AI and software company with a modular system allows us the flexibility to make sure that we can work with sleep practices at whichever complexity level they think is most appropriate for a given patient,” Turkington says.
Jain also notes that the incoming structure allows the industry to adapt. Marketers “are able to create multiple devices across specific codes, have modular devices, or can do all three codes,” he says. “It provides flexibility.”
Splitting Technical and Professional Components
A fundamental change in the 2027 set is the formal separation of technical services from professional interpretation. Codes 95X18, 95X19, and 95X20 cover the technical component (setup, data acquisition, and technical analysis), while 95X21, 95X22, and 95X23 cover the professional component (interpretation and report).
Sleep physician Amy Aronsky, DO, FAASM, who was not involved in creating the new code set, says this split aligns with the actual delivery of care in modern practices. “This structure lets each piece be valued on its own merits and supports different business models, such as hospital-owned tech with independent physician readers,” she says.
From a billing and operational standpoint, this separation mirrors standard practices in specialties like radiology and cardiology. Adam Nager, CEO and owner of Quest National Billing, notes that the split allows sleep medicine practices to “divide and conquer” based on their strengths. “That just allows you to be a distributor, the technical component, versus being the person reading it, the provider, separately,” Nager says.
Industry Reception
Across the sleep subspecialty, there is broad consensus that the 2027 CPT code set represents a positive step forward. Stakeholders from clinical practice, medical billing, and device manufacturing overwhelmingly agree that the new codes are a modernization that aligns coding with contemporary clinical practice and new technologies.
EnsoData’s Turkington says the company “welcomes the new codes, which let providers consider more levels of clinical appropriateness as well as copays, scheduling, and wait times, in order to choose the right study for their patients.”
Similarly, ZOLL Itamar’s Amitai notes that shifting from rigid channel requirements to a framework based on clinical study output “represents an innovative and more appropriate approach for evaluating the clinical value of sleep studies.”
Bogi Palsson, CEO of SleepImage, welcomes the updates too. “SleepImage welcomes the change to the CPT code definitions which seem to be generally intended to reflect the current state of validated and FDA-cleared modalities in home sleep apnea testing,” Palsson says. He adds that the company remains “confident that SleepImage will continue to provide clinical value and improved quality of life for patients and retain its relative reimbursement value compared to other options within the proposed new CPT codes.”
Physician Aronsky says, “The old unattended codes did not capture correct coding for new [home sleep apnea testing] technology,” adding that “the new codes are an improvement both for clinical accuracy and for payment logic.”
Clarifying ‘Channel’ and ‘Parameter’ Ambiguities
However, the definitions of “channels” and “parameter categories” remain a point of confusion. To that end, stay tuned for the American Medical Association (AMA) CPT Manual in October 2026, the guidance in which is expected to resolve the ambiguity.
The inclusion of “derived channels”—signals calculated from other sensors—is a particularly nuanced area where stakeholders desire more guidance. Turkington characterizes it as a “slippery slope.” “Take one common example: a light-based fingertip photoplethysmography (PPG) sensor is used to measure 3 channels: PPG, pulse rate, and SpO2. By the strictest definition, this means that SpO2 is a ‘derived channel’ because it is derived from the PPG,” Turkington says. “I think that few clinicians would take this stance, however, since SpO2and pulse rate measure two separate things and clinicians generally regard them as separate channels, not as derived channels.”
To avoid billing errors, Aronsky advises physicians to ask manufacturers for a clear, written mapping. “Differentiate ‘marketing channels’ from billable channels,” she warns. “Some devices advertise ‘X channels’ but count internal derived metrics or duplicated signals. For coding, what matters is clinically meaningful, distinct physiologic channels.”
Valuation Concerns
A significant point of contention in the CMS proposed rule involves the valuation of the high-complexity professional code (95X23). While the Relative Value Scale Update Committee (RUC) recommended a work relative value unit (RVU) of 1.60, CMS has proposed a lower value of 1.42, based on a crosswalk to an ophthalmological service code (92014).
CMS expressed concern that the RUC’s recommended value would result in an intensity that is “nearly double” that of the low- and moderate-complexity codes. The AASM and other stakeholders have indicated they will argue for the original, higher recommendation during the public comment period.
There are also concerns regarding the technical component valuations. Amitai points to an “unreasonable and hard-to-explain gap” in the 95X19 (moderate complexity) technical valuation. He notes that while the jump from low to moderate complexity requires significant additional technology, the proposed technical RVU increase is only about 10%, whereas the jump from moderate to high complexity is over 160%.
“If finalized unchanged, it could create financial incentives that favor either lower- or higher-complexity testing over moderate-complexity studies,” Amitai says. “This can deter manufacturers from investing in new technologies for sleep apnea diagnostics.”
Furthermore, CMS requested comments on the 16-hour equipment time assumption used for practice expense calculations.
Preparing for Implementation
With the Jan 1 effective date approaching, billing experts warn that the transition requires proactive administrative planning. Quest National Billing’s Nager stresses that practices cannot afford to wait until January to update their workflows.
“What typically happens is everybody forgets,” Nager says. If a home sleep test is filed with the same code on Jan 6 as it was on Dec 15, a denial will result. “Then Feb 1 rolls around, and the sleep center is wondering why their cash flow is deficient,” says Nager, who has helped stakeholders in many specialties handle similar transitions for more than a decade.
Mark a Dec 15 deadline in your calendar to check in and update key aspects, Nager says, including:
- Channels and Parameter Catagories: Record device type, channel count, and parameter categories specificity. “If it’s not documented, it didn’t happen,” Nager says.
- System Updates: Log into electronic medical record and billing systems (such as eClinicalWorks, Dentrix) to load the new code set and attached fee schedules.
- Prior Authorizations: Verify whether payers require new authorizations for the 2027 codes. Nager notes that there is typically no retroactive fix for a denial due to a missing prior authorization.
- Payer Readiness: Be prepared for the possibility that some payers or clearinghouses will not be compliant on Jan 1. “If a payer hasn’t been able to load a fee schedule, most times they won’t load the code,” Nager says.
Ensuring a Seamless Transition
Once the codes are live, the first 8 to 12 weeks of the year are critical for identifying trends and avoiding a potential long-term revenue hit if denials occur. Nager suggests that practice managers schedule a 15-minute weekly billing performance review specifically for the new HST codes.
“Ask three simple questions: How many did we charge out? What did we get paid? What were the denials?” Nager says. “If you do that, you can take quick action. You might find a payer hasn’t loaded the fee schedule yet, which is a small deal if caught early, but a big deal if you wait until March or April.”
So will the incoming codes ultimately improve reimbursement accuracy and simplify billing, or will they create new administrative challenges? “Both are true,” Aronsky predicts.
In Aronsky’s view, the improvements include:
- Better reimbursement accuracy: complexity‑tiered codes reduce the mismatch between simple home sleep testing and advanced multi‑parameter studies.
- Cleaner separation of roles: technical versus professional components align with how services are actually delivered.
- More future‑proof: the framework can accommodate new technologies and broader sleep disorder evaluation beyond obstructive sleep apnea.
But the challenges entail:
- Practices must retool workflows, update electronic medical record templates, and retrain billing staff.
- Payers may initially interpret complexity thresholds inconsistently, leading to denials or audits.
- Physicians will need to document channels and parameter categories more explicitly to support code selection.
As the industry awaits the final rule in October 2026, the AASM plans to roll out extensive educational resources, including coding FAQs and webinars. Jain cautions practices that third-party information circulating before then is not authoritative. “Everything up until then may be a company’s interpretation,” Jain says. “It might help you orient yourself to what’s coming, but make no drastic decision based on what you’re hearing before October.”
For now, sleep practices can prepare for the transition, but the final rule and forthcoming CPT guidance will determine exactly how the new complexity-based framework works in practice.
Reference:
Centers for Medicare & Medicaid Services. Medicare and Medicaid programs; CY 2027 payment policies under the Physician Fee Schedule and other changes to Part B payment and coverage policies; Medicare Shared Savings Program requirements; and Medicare Prescription Drug Inflation Rebate Program. Fed Regist. 16 Jul 2026;91(135):43842-4557.
