ICD-10-PCS
The Procedural Coding System used in the United States to report inpatient hospital procedures.
1 min read · Last reviewed May 23, 2026
At a glance
- Category
- Coding
- Primary sources
- 2
- Workspace handoff
- ask d3 →
Where this comes up
Coders meet this term inside the chart at the moment of code selection — picking the E/M level, attaching the right modifier, defending the procedure code against an NCCI edit, or answering an auditor who pulled the encounter for a payer-initiated review.
Full definition
What it is in practice
ICD-10-PCS is the CMS-maintained inpatient procedure code set. It is not used in physician office claims — those use CPT/HCPCS — but coders in hospital settings need it for MS-DRG assignment.
How it shows up in your practice
Physician office billers will not encounter PCS directly. Coders working with hospital facility claims need the annual PCS update.
Sources
- CMS — ICD-10 Resourceshttps://www.cms.gov/medicare/coding-billing/icd-10-codes
- CMS — MS-DRG Classifications and Softwarehttps://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps/ms-drg-classifications-and-software
Reference inpatient codes in Ask D3
Open ask d3 →Related terms
- CodingICD-10-CMThe Clinical Modification of the WHO ICD-10 code set used in the United States to report diagnoses.
- BillingMS-DRGMedicare Severity Diagnosis Related Groups — the classification system used to pay inpatient hospital admissions under Medicare's prospective payment system.
- BillingInpatient Hospital BillingFacility billing for hospitalized patients, classified using the MS-DRG system under the Acute Inpatient Prospective Payment System.
D3rx is a healthcare-billing and compliance research aid maintained by D3rx Inc. Articles are drafted by an LLM (Anthropic Claude) against primary HHS, OCR, CMS, eCFR, NIST, and state-regulator publications, and reviewed for restraint and source fidelity by the D3rx team.
Reviewer status: a named credentialed reviewer (CHC, CHPC, or healthcare attorney) is being engaged. Until that engagement is finalized, this page does not claim credentialed review.
Related across the archive
- GlossaryICD-10-CMThe Clinical Modification of the WHO ICD-10 code set used in the United States to report diagnoses.
- GlossaryInpatient Hospital BillingFacility billing for hospitalized patients, classified using the MS-DRG system under the Acute Inpatient Prospective Payment System.
- GlossaryMS-DRGMedicare Severity Diagnosis Related Groups — the classification system used to pay inpatient hospital admissions under Medicare's prospective payment system.
- GlossaryICD-10-CM Z CodeICD-10-CM categories Z00-Z99 used to document encounters for reasons other than disease or injury, including screenings, follow-up, social determinants, and personal/family history.
- GlossaryDocumentation SpecificityThe level of detail in clinical documentation needed to support the diagnosis and service codes reported.
- GlossaryUnspecified Diagnosis CodeAn ICD-10-CM code ending in characters that signal the documentation lacked the specificity for a more precise code.
- Billing99214 vs 99215: When to Bill Each CodeLearn the difference between 99214 and 99215: when each applies, what documentation you need, and the $40/visit revenue impact.
- BillingThe ICD-10 Codes That Get Primary Care Claims Denied (and How to Pick the Right One)I10 vs I11, E11.9 vs E11.40, Z00.00 vs Z00.01. The diagnosis coding mistakes that cause denials and how to fix them.
This glossary entry is a research aid for billing and compliance staff. It does not provide legal, medical, or financial advice and does not replace counsel. References cited link to primary sources at HHS, OCR, CMS, eCFR, NIST, and the relevant payer or industry body.