--- title: "MS-DRG, MS-DRG | MedTech Terms" description: "Medicare's inpatient hospital payment classification system. Plain-English Reimbursement definition for MedTech teams, with examples and related terms." lang: en json-ld: | { "@context": "https://schema.org", "@graph": [ { "@type": "DefinedTerm", "@id": "https://medtechterms.com/terms/ms-drg#term", "name": "MS-DRG", "alternateName": "MS-DRG", "description": "Medicare Severity Diagnosis-Related Groups classify inpatient stays into payment groups based on diagnosis, procedures, age, and complications. 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Reviewed by [Christian Espinosa, Founder, Blue Goat Cyber](/authors/christian-espinosa) Last reviewed May 5, 2026 ## Definition Medicare Severity Diagnosis-Related Groups classify inpatient stays into payment groups based on diagnosis, procedures, age, and complications. Each MS-DRG carries a relative weight; the hospital is paid a bundled rate regardless of actual cost. What the regulation says Medicare Severity-Diagnosis Related Groups (MS-DRGs) are a prospective payment system used by the Centers for Medicare & Medicaid Services (CMS) in the United States to reimburse hospitals for inpatient stays under Medicare Part A. This system is mandated by federal regulations, with details published annually in the Federal Register, outlining the classification logic and payment rates. The goal is to incentivize efficiency while ensuring appropriate payment for patient care, as described in CMS publications and guidelines. ## What this means in practice For inpatient device-based procedures, MS-DRG assignment determines whether the hospital is paid enough to cover the device cost. Inadequate MS-DRG mapping is a major commercial barrier; [NTAP](/terms/ntap) and new technology reassignment are remedies. ## Examples - A hospital performing a complex cardiac procedure with an innovative implantable device relies on the assigned MS-DRG to cover the costs of the device, staff, and other resources. - A MedTech company developing a new surgical robot must understand the potential MS-DRG classifications for procedures using its robot to predict adoption rates and financial viability for hospitals. - During an audit, CMS reviews a hospital's medical records to verify that the assigned MS-DRG accurately reflects the patient's condition and the medical services provided. Common pitfalls - • Hospitals may inadvertently undercode or overcode, leading to incorrect reimbursement and potential audit scrutiny. - • Device manufacturers might misunderstand how device costs are incorporated into MS-DRG payments, impacting market access strategies. - • A lack of proper documentation for a device or procedure can lead to an unfavorable MS-DRG assignment. - • Assuming that an innovative MedTech product will automatically receive adequate reimbursement without specific CMS pathways like NTAP is a common mistake. - • Failing to consider the impact of MS-DRG assignment on post-market surveillance costs or potential recalls can lead to financial strain. ## Frequently asked questions How do MS-DRGs relate to medical device market access? MS-DRG assignment directly influences hospital reimbursement for procedures involving medical devices. If the assigned MS-DRG payment does not adequately cover the device cost, hospitals may be hesitant to adopt the technology, creating a market access barrier for device manufacturers. What is the role of clinical documentation in MS-DRG assignment? Are MS-DRGs used outside of the US? ## Related terms Grouped by theme ### Editor's picks · Hand-selected related concepts [ Reimbursement Inpatient Prospective Payment System(IPPS) Medicare's payment system for inpatient hospital stays. ](/terms/ipps)[ Reimbursement New Technology Add-On Payment(NTAP) Supplemental Medicare payment for inpatient use of qualifying new technologies. ](/terms/ntap) ### More in Reimbursement · Same category [ Reimbursement 340B Drug Pricing Program(340B) Federal program providing discounted drugs to safety-net providers. ](/terms/340b)[ Reimbursement Ambulatory Payment Classification(APC) The Medicare grouping system that determines hospital outpatient payment amounts under OPPS, analogous to MS-DRGs for inpatient. ](/terms/apc)[ Reimbursement ASC Site-of-Service Shift Migration of procedures from hospitals to ambulatory surgery centers. ](/terms/asc-shift)[ Reimbursement Budget Impact Model(BIM) Financial model that estimates the total cost consequences of adopting a new technology to a payer's budget over a defined horizon. ](/terms/budget-impact-model) Cited by Where this term appears across MedTech Terms. Ecosystems (1) - [Hospital Buyer & Reimbursement](/ecosystems/hospital-buyer) ## Primary references 3 sources Link health: 3 verified · last checked 2026-06-20 CMS· 1 AMA· 1 AdvaMed· 1 1. [1 CMS MS-DRG Verified CMS · cms.gov ](https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps) 2. [2 AMA CPT Resources Verified AMA · ama-assn.org ](https://www.ama-assn.org/practice-management/cpt) 3. [3 AdvaMed - Payment & Coverage Verified AdvaMed · advamed.org ](https://www.advamed.org/our-work/) Inline markers like \[1\] jump to the matching reference above. Sponsor note ### Need cybersecurity expertise on a connected-device launch? Blue Goat Cyber helps MedTech teams ship connected products that hospital security teams will actually procure. [Book a 30-minute discovery session](https://go.bluegoatcyber.com/meetings/blue-goat-cyber/discovery-session) - No obligation - Expert-led from minute one - NDA available on request MedTech Terms is a community resource sponsored by [Blue Goat Cyber](https://bluegoatcyber.com). Definitions are independent of any vendor. On this term Category Reimbursement Acronym MS-DRG Sources 3 Updated 5/5/2026 [Compare with another term](/compare?a=ms-drg) Learn in 60 seconds Card Lesson Quiz Medicare's inpatient hospital payment classification system. - · For inpatient device-based procedures, MS-DRG assignment determines whether the hospital is paid enough to cover the device cost. - · Inadequate MS-DRG mapping is a major commercial barrier; NTAP and new technology reassignment are remedies. - · Each MS-DRG carries a relative weight; the hospital is paid a bundled rate regardless of actual cost. Remember this Watch out: Hospitals may inadvertently undercode or overcode, leading to incorrect reimbursement and potential audit scrutiny. Related terms - [New Technology Add-On Payment(NTAP) ](/terms/ntap) - [Inpatient Prospective Payment System(IPPS) ](/terms/ipps) You may also need Auto-suggested from Reimbursement and shared keywords. - [Ambulatory Payment Classification(APC) ](/terms/apc) - [Outpatient Prospective Payment System(OPPS) ](/terms/opps) - [Site-Neutral Payment ](/terms/site-neutral-payment) - [ICD-10-CM / ICD-10-PCS ](/terms/icd-10) - [Budget Impact Model(BIM) ](/terms/budget-impact-model) - [Medicare Physician Fee Schedule(MPFS) ](/terms/physician-fee-schedule) [All Reimbursement terms](/terms?cat=Reimbursement) MedTech Terms An authoritative, plain-language reference for the regulatory, quality, cybersecurity, and software terms that shape modern medical devices. 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