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    v1.0.30
    OpenPayerBilling CodesOther ServicesHCPCS hcpcs-level-ii-m1326-hypotony-evaluation-management
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    HCPCS Level II M1326: Patients with a Diagnosis of Hypotony

    HCPCS Level II code M1326 designates services for patients with a diagnosis of hypotony, indicating evaluation and management in an ophthalmic context; the service type is ophthalmology/eye care, typically delivered in an outpatient ophthalmology clinic or ambulatory surgical center where intraocular pressure assessment and related therapeutic measures are provided.

    For related coverage guidance, see recent payer policy updates: Hospital Beds Corporate Medical Policy, Patient Lifts, Home Non-Invasive Positive Pressure Ventilation (NIPPV) Devices for Respiratory Insufficiency and Failure.

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult referred to an ophthalmology clinic for evaluation and management of ocular hypotony (abnormally low intraocular pressure). The patient often presents with blurry vision, eye pain or discomfort, decreased visual acuity, or choroidal folds following recent glaucoma surgery, intraocular inflammation, or trauma. Clinical workflow includes intake vitals and ocular history, targeted ocular exam including visual acuity and slit-lamp examination, measurement of intraocular pressure with applanation tonometry, dilated fundus exam to assess for choroidal effusion or maculopathy, and imaging as indicated (optical coherence tomography, B-scan ultrasound). Management steps documented under this billing descriptor may include diagnostic assessment, topical or systemic medical therapy initiation, subconjunctival injections, surgical revision of filtering procedures, or observation with serial pressure checks. Procedure documentation should note the diagnosis of hypotony using M1326, the laterality, clinical findings, treatments rendered, informed consent, time spent counseling, and any applicable modifier (for example when services are reduced, discontinued, or performed under unusual circumstances). Typical site of service is an ophthalmology clinic or ambulatory surgical center; inpatient encounters may occur for complicated postoperative hypotony requiring urgent surgical intervention.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    92083Extended ophthalmological service; medical examination and evaluation with initiation of diagnostic and treatment program, for established patient, typically 40 minutesUsed for detailed evaluation and management during a prolonged visit for hypotony assessment and counseling.
    92250Fundus photography with interpretation and reportUsed to document choroidal folds, effusions, or maculopathy associated with hypotony.
    92134Scanning computerized ophthalmic diagnostic imaging, posterior segment, with interpretation and report (OCT)Used to evaluate macular edema or structural changes from hypotony.
    76512Ophthalmic ultrasound, B-scan, with interpretation and reportUsed when media opacity or posterior evaluation is needed to assess choroidal effusion or detachment.
    66170Anterior chamber paracentesis (e.g., for elevated or low IOP management)Performed in select cases to manage intraocular pressure acutely; may be part of hypotony management.
    66180Reformation of anterior chamber with injection of viscoelastic substanceUsed to restore chamber depth and temporarily elevate intraocular pressure in hypotony cases.

    Related Modifiers

    8 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    54Modifier ‑54 (“Surgical care only”) is appended to a CPT surgical procedure when the reporting surgeon performs the intraoperative (surgical) component but does not furnish the preoperative and/or…- Use modifier -54 when the reporting surgeon provided only the intraoperative (surgical) component of a procedure and preoperative and/or postoperative management has been or will be provided by…
    55Modifier –55 indicates the billing provider furnished only postoperative management for a procedure that has a global surgical period. According to AAPC, this modifier is appended to the same CPT…- Use modifier -55 when billing the same CPT surgical code that has a 10- or 90-day global period and you, as a provider other than the original surgeon, furnished ONLY postoperative management (no…
    56Modifier ‑56 indicates the reporting provider furnished only the preoperative management for a surgical procedure and did not perform the intraoperative or postoperative care. It is used in…- Use Modifier -56 when a provider performs only the preoperative management in a split‑care situation (one physician manages preop care while a different physician performs the intraoperative…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207W00000X
    207K00000X
    2084P0800X
    363L00000X
    207T00000X
    2083P0011X
    164W00000X
    2083A0300X

    Related Payer Policy Updates

    Specialty: Durable Medical Equipment (DME)1 / 2

    10 rows

    PolicyPayerEffective Date
    Hospital Beds Corporate Medical Policybcbsvermont2027-01-01
    Patient Liftsuniverahealthcare2026-11-16
    Home Non-Invasive Positive Pressure Ventilation (NIPPV) Devices for Respiratory Insufficiency and Failureexcellus_health_plan_inc2026-10-15
    Positive Airway Pressure Devices for Pulmonary Disorders Continued RentalCareSource Georgia2026-10-01
    Bone Growth StimulatorsProvidence Health Plan2026-10-01
    Durable Medical Equipment (DME) Medical Necessity and CoverageMass General Brigham Health Plan2026-10-01
    Speech Generating DevicesMass General Brigham Health Plan2026-10-01
    Interferential Stimulation Devices (for home use)Moda Health2026-10-01
    Durable Medical Equipment (DME): Tumor Treating Fields (Alternating Electric Field Therapy) Medical GuidelineWPS Health Insurance2026-10-01
    Durable Medical Equipment (DME): Bone Growth Stimulators Medical GuidelineWPS Health Insurance2026-10-01

    Related Codes

    HCPCS-LEVEL-II-M1252-AMBULATORY-PALLIATIVE-CARE-SURVEY-NONCOMPLETION

    HCPCS M1252: Ambulatory Palliative Care Patient Experience Survey Incomplete

    HCPCS-LEVEL-II-M1255-POSITIVE-PREGNANCY-TEST-NON-OB-VISIT

    HCPCS Level II M1255: Visit with Positive Pregnancy Test, Not Established OB

    HCPCS-LEVEL-II-M1278-ELEVATED-BLOOD-PRESSURE-WITH-DOCUMENTED-FOLLOW-UP

    HCPCS Level II M1278: Elevated or Hypertensive Blood Pressure Reading Documented

    HCPCS-LEVEL-II-M1292-FRAILTY-WITH-ADVANCED-ILLNESS-66-PLUS

    HCPCS M1292: Frailty with Advanced Illness, Age 66 and Older

    HCPCS-LEVEL-II-M1300-INFLUENZA-IMMUNIZATION-NOT-ADMINISTERED

    HCPCS Level II M1300: Influenza Immunization Not Administered, Documented Reason

    HCPCS-LEVEL-II-M1356-PATIENTS-WHO-DIED-DURING-MEASUREMENT-PERIOD

    HCPCS Level II M1356: Patients Who Died During Measurement Period

    HCPCS-LEVEL-II-M1375-RA-ADDITIONAL-ENCOUNTER-90-DAYS

    HCPCS Level II M1375: Additional Rheumatoid Arthritis Encounter

    HCPCS-LEVEL-II-M1384-PATIENTS-DIED-PERFORMANCE-PERIOD

    HCPCS Level II M1384: Patient Death During Performance Period

    HCPCS-LEVEL-II-M1490-PATIENT-STATUS-NOT-DOCUMENTED

    HCPCS Level II M1490: Patient Status Not Documented

    HCPCS-LEVEL-II-M1503-VASCULAR-SURGERY-MIPS-VALUE-PATHWAY

    HCPCS Level II M1503: Vascular Surgery MIPS Value Pathway

    Showing 1–10 of 356

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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