What are the different types of service codes used in Medicare?

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Medicare uses several distinct types of service and setting codes on claims to process and categorize medical billing correctly.

📌 Place of Service (POS) Codes

These two-digit numeric codes show the physical setting where a healthcare service was provided.

  • 11 – Office: Location where health professionals routinely provide private care.
  • 12 – Home: Location of the patient's personal residence.
  • 21 – Inpatient Hospital: Facility providing 24-hour acute care.
  • 22 – On-Campus Outpatient Hospital: Hospital area providing outpatient services.
  • 23 – Emergency Room: Hospital emergency department setting.
  • 31 – Skilled Nursing Facility: Facility providing skilled nursing care.

📊 Type of Service (TOS) Indicators

Assigned by Medicare to classify the exact nature of the medical item or service rendered.

  • 0 – Whole Blood
  • 1 – Medical Care
  • 2 – Surgery
  • 4 – Diagnostic Radiology
  • 5 – Diagnostic Laboratory
  • A – Durable Medical Equipment (DME)
  • D – Ambulance

🗓️ Type of Bill (TOB) Codes

Four-digit alphanumeric codes (starting with a leading zero) used on institutional Part A claims to identify the facility type, specific care sequence, and bill frequency.

  • 011X – Hospital — Inpatient
  • 012X – Hospital — Inpatient Part B
  • 013X – Hospital — Outpatient
  • 021X – Skilled Nursing Facility — Inpatient
  • 032X – Home Health — Part A/B Coverage

What are the types of service codes?

Service codes in healthcare and medical billing generally fall into categories like Type of Service (TOS) indicators, Service Type Codes (STCs), and Place of Service (POS) codes.

Type of Service (TOS) Codes

TOS codes group billed procedures into general care categories to control payment rules, pricing, and coverage. They use single numbers or letters:

  • Numeric Indicators (0–9): Cover categories like 1 (Medical Care), 2 (Surgery), 3 (Consultation), 4 (Diagnostic Radiology), 5 (Diagnostic Laboratory), and 7 (Anesthesia).
  • Alphabetic Indicators (A–W): Cover specialized supplies or care types like A (Durable Medical Equipment), D (Ambulance), H (Hospice), V (Vaccines), and W (Physical Therapy).
  • You can read more about these groupings in the CMS Type of Service Guidelines.

Service Type Codes (STCs)

STCs are standardized two-digit codes used in Electronic Data Interchange (EDI) transactions (like eligibility checks and claims) to specify healthcare service categories.

  • Examples: 01 (Medical Care), 35 (Dental), 47 (Hospital), 50 (Dentistry), and 88 (Pharmacy).
  • The X12 Service Type Codes Directory maintains the official list of over 100 active codes.

Place of Service (POS) Codes

POS codes are two-digit numeric codes that show where a medical service was physically or virtually performed. Payers use them to adjust reimbursement rates based on overhead costs.

  • Facility POS Codes: Locations like 21 (Inpatient Hospital), 22 (Outpatient Hospital), 23 (Emergency Room), and 31 (Skilled Nursing Facility).
  • Non-Facility POS Codes: Locations like 11 (Office), 12 (Home), and 20 (Urgent Care Facility).
  • Telehealth POS Codes: 02 (Telehealth Other than in Patient's Home) and 10 (Telehealth in Patient's Home).
  • The full set is managed via the CMS Place of Service Code Set.

What are the 6 types of CPT codes?

The Current Procedural Terminology (CPT) code set is divided into six main sections under Category I, which cover standard medical procedures and services.

The 6 Sections of CPT Codes

  • Evaluation and Management (E/M): Covers doctor visits, consultations, and routine checkups (such as office visits).
  • Anesthesia: Covers pain management and administration of local or general anesthesia during procedures.
  • Surgery: The largest section, covering operations and invasive procedures performed by surgeons or medical staff.
  • Radiology: Covers imaging tests like X-rays, MRIs, CT scans, and ultrasounds.
  • Pathology and Laboratory: Covers blood tests, biopsies, and tissue analysis processed in a lab.
  • Medicine: Covers non-surgical treatments and services, such as physical therapy, vaccinations, and injections.

(Note: While Category I contains these six major sections, the broader CPT system also includes Category II codes for performance tracking and Category III codes for emerging technology).

What is the difference between a CPT code and a service code?

A CPT code is a specific type of service code used in healthcare to describe medical, surgical, and diagnostic procedures.

The main difference is that service code is a broad, general term for any code used to bill for healthcare tasks, while a CPT code (Current Procedural Terminology) is one specific, standardized 5-digit system under that umbrella.

CPT Codes

  • What they are: A standardized 5-digit code set created by the American Medical Association (AMA).
  • What they do: They tell an insurance company what specific procedure or service a doctor or health professional performed (such as a routine office visit or a surgical operation).
  • Who manages them: The American Medical Association.

Service Codes

  • What they are: A general category name used in medical billing for any code that explains what was done or provided during a visit.
  • What they include: They include CPT codes (HCPCS Level I) for doctor procedures, but they also include HCPCS Level II codes, which cover items like medical equipment, ambulance rides, and supplies.
  • How they relate: People often use "service code" as an informal label on a bill or superbill when referring to a CPT or procedural code.

What are some common medical billing service codes?

Medical billing uses the official Place of Service Code Set maintained by the Centers for Medicare & Medicaid Services (CMS) as two-digit identifiers to indicate where a healthcare service happened.

Common Place of Service (POS) Codes

  • 02: Telehealth Other than Home
  • 10: Telehealth in Home
  • 11: Office (Clinic or doctor's office)
  • 12: Patient Home
  • 20: Urgent Care Facility
  • 21: Inpatient Hospital
  • 22: On-Campus Outpatient Hospital
  • 23: Emergency Room - Hospital
  • 24: Ambulatory Surgical Center
  • 31: Skilled Nursing Facility

Other Core Medical Billing Code Types

  • CPT Codes: Current Procedural Terminology codes describe the specific medical, surgical, or diagnostic procedure performed.
  • HCPCS Level II Codes: Report supplies, ambulance rides, injections, and durable medical equipment.
  • ICD-10-CM Codes: Detail the patient diagnosis and establish medical necessity for the service.

Medicare Parts A, B, C, and D (Explained)

9 related questions found

What are the four types of codes?

The four primary types of computer programming paradigms (coding styles) are imperative, functional, logical, and object-oriented.

1. Imperative Programming

  • What it is: Code that gives the computer a step-by-step sequence of commands telling it how to achieve a result.
  • Focus: Changing program states and controlling the exact flow of execution using loops and variables.
  • Examples: C, Pascal, and Fortran.

2. Functional Programming

  • What it is: Code built entirely around mathematical functions where values are immutable (unchangeable).
  • Focus: Evaluating pure functions and avoiding shared state or side effects.
  • Examples: Haskell, Lisp, and Clojure.

3. Logical Programming

  • What it is: Code based on a set of logical rules and facts rather than step-by-step commands.
  • Focus: Telling the computer what the rules and desired goal are, letting the system figure out how to solve it.
  • Examples: Prolog and Datalog.

4. Object-Oriented Programming (OOP)

  • What it is: Code organized around "objects" and "classes" that bundle data and behaviors together.
  • Focus: Modularity, reusability, and modeling real-world entities.
  • Examples: Java, C++, and Python.

What are the different Medicare condition codes?

Medicare condition codes are two-character numeric or alphanumeric codes entered on institutional billing forms (like the UB-04) to describe specific conditions, events, or administrative circumstances that affect how a claim is processed.

Common Categories and Examples

  • Adjustment and Cancellation Codes (D0–D9, E0): Used to indicate billing changes, such as D0 for service date changes, D1 for total charge adjustments, or D9 for other specific corrections.
  • Medicare Secondary Payer (MSP) Codes (01–H0): Explain primary and secondary insurance situations, such as 02 for employment-related conditions or 06 for end-stage renal disease (ESRD) entitlement periods.
  • Specialized Care and Treatment (e.g., 44, 59, 74, 84): Code 44 notes an inpatient admission changed to outpatient before submission; 59 indicates a non-primary ESRD facility; 74 denotes home dialysis; and 84 covers dialysis for acute kidney injury.
  • Disaster and Special Situations (e.g., DR, KX): Code DR flags disaster-related claims tied to formal regional or national waivers, while KX confirms required specific medical documentation is on file.

You can view the full official registry through the NUBC Official UB-04 Data Specifications Manual.

What are the common CPT codes used in Medicare?

The most common Current Procedural Terminology (CPT) codes billed under Medicare include routine office visits, basic lab tests, and common diagnostic evaluations.

Frequently Billed Medicare CPT Codes

  • 99213: Office or other outpatient visit for an established patient, requiring a low-to-moderate level of medical decision making (typically lasting 20–29 minutes).
  • 99214: Office or other outpatient visit for an established patient, requiring a moderate level of medical decision making (typically lasting 30–39 minutes).
  • 36415: Routine venipuncture (collection of a venous blood sample by needle/syringe).
  • 80053: Comprehensive metabolic panel (blood test measuring various chemicals and organ functions).
  • 93000: Routine electrocardiogram (ECG/EKG) tracing with complete interpretation and report.

Finding Official Utilization Data

The Centers for Medicare & Medicaid Services (CMS) publishes official data reports detailing the most frequently billed services. You can review specific frequency metrics and national utilization patterns through the CY Top 200 Level I CPT Codes Ranked by Services page.

Is 99214 a CPT or HCPCS code?

Code 99214 is a CPT code.

Overview

  • Type: Current Procedural Terminology (CPT) Evaluation and Management (E/M) code.
  • Description: Represents a Level 4 office or outpatient visit for an established patient.
  • Requirements: Requires a moderate level of medical decision-making (MDM) or a total time of 30 to 39 minutes on the date of the encounter.

What are 5 common CPT codes?

Five common Current Procedural Terminology (CPT) codes used in routine medical practice include office visits, lab tests, and basic evaluations.

Common CPT Codes

  • 99213: Office or other outpatient visit for the evaluation and management of an established patient, typically lasting 20 to 29 minutes.
  • 99214: Office or other outpatient visit for an established patient, typically lasting 30 to 39 minutes with a moderate level of medical decision-making.
  • 36415: Routine venipuncture, meaning drawing blood from a vein using a needle.
  • 93000: Routine electrocardiogram (ECG/EKG) tracing with at least 12 leads, including the interpretation and report.
  • 71045: Chest X-ray, single view.